switch to go vendoring

vendor/github.com/egirna/icap-client/.gitignore

@@ -0,0 +1,20 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+vendor/
+go.sum
+
+# Misc
+.DS_Store
+logs.txt

vendor/github.com/egirna/icap-client/.travis.yml

@@ -0,0 +1,19 @@
+dist: xenial
+
+language: go
+
+env:
+  - GO111MODULE=ON
+
+go:
+  - 1.12.x
+
+git:
+  depth: 1
+
+
+notifications:
+  email: true
+
+script:
+  - go test -v -count=1 .

vendor/github.com/egirna/icap-client/CONTRIBUTING.md

@@ -0,0 +1,9 @@
+# Contributing
+
+1. Fork the repo
+
+1. Make the change
+
+1. Update the README.md with details of the changes (if needed)
+
+1. Open your pull request against the dev branch

vendor/github.com/egirna/icap-client/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
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+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
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+      including but not limited to software source code, documentation
+      source, and configuration files.
+
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+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
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+      (an example is provided in the Appendix below).
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+      form, that is based on (or derived from) the Work and for which the
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+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
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+      the Work and Derivative Works thereof.
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+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
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+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
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+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
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+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
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+   4. Redistribution. You may reproduce and distribute copies of the
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+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
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+          stating that You changed the files; and
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+          notices within Derivative Works that You distribute, alongside
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+          that such additional attribution notices cannot be construed
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+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
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+
+   9. Accepting Warranty or Additional Liability. While redistributing
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+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
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+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/github.com/egirna/icap-client/README.md

@@ -0,0 +1,95 @@
+# icap-client
+
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
+[![Project status](https://img.shields.io/badge/version-0.1.0-green.svg)](https://github.com/egirna/icap-client/releases)
+[![GoDoc](https://godoc.org/github.com/egirna/icap-client?status.svg)](https://godoc.org/github.com/egirna/icap-client)
+
+
+Talk to the ICAP servers using probably the first ICAP client package in GO!
+
+### Installing
+```console
+go get -u github.com/egirna/icap-client
+
+```
+
+### Usage
+
+**Import The Package**
+
+```go
+import ic "github.com/egirna/icap-client"
+
+```
+
+**Making a simple RESPMOD call**
+
+```go
+
+  req, err := ic.NewRequest(ic.MethodRESPMOD, "icap://<host>:<port>/<path>", httpReq, httpResp)
+
+  if err != nil {
+    log.Fatal(err)
+  }
+
+  client := &ic.Client{
+		Timeout: 5 * time.Second,
+	}
+
+  resp, err := client.Do(req)
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+```
+
+**Note**: ``httpReq`` & ``httpResp`` here are ``*http.Response`` & ``*http.Request`` respectively
+
+**Setting preview obtained from OPTIONS call**
+
+```go
+
+  optReq, err := ic.NewRequest(ic.MethodOPTIONS, "icap://<host>:<port>/<path>", nil, nil)
+
+  if err != nil {
+    log.Fatal(err)
+    return
+  }
+
+  client := &ic.Client{
+    Timeout: 5 * time.Second,
+  }
+
+  req.SetPreview(optReq.PreviewBytes)
+
+  // do something with req(ICAP *Request)
+
+```
+
+**DEBUG Mode**
+
+Turn on debug mode to inspect detailed & verbose logs to debug your code during development
+
+```go
+  ic.SetDebugMode(true)
+
+```
+
+By default the icap-client will dump the debugging logs to the standard output(stdout), but you can always add your custom writer
+
+```go
+  f, _ := os.OpenFile("logs.txt", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+  ic.SetDebugOutput(f)
+```
+
+For more details, see the [docs](https://godoc.org/github.com/egirna/icap-client) and [examples](examples/).
+
+
+### Contributing
+
+This package is still WIP, so totally open to suggestions. See the contributions guide [here](CONTRIBUTING.md).
+
+### License
+
+**icap-client** is licensed under the [Apache License](LICENSE).

vendor/github.com/egirna/icap-client/client.go

@@ -0,0 +1,115 @@
+package icapclient
+
+import (
+	"net/http"
+	"strconv"
+	"time"
+)
+
+// Client represents the icap client who makes the icap server calls
+type Client struct {
+	scktDriver *Driver
+	Timeout    time.Duration
+}
+
+// Do makes  does everything required to make a call to the ICAP server
+func (c *Client) Do(req *Request) (*Response, error) {
+
+	if c.scktDriver == nil { // create a new socket driver if one wasn't explicitly created
+		port, err := strconv.Atoi(req.URL.Port())
+
+		if err != nil {
+			return nil, err
+		}
+		c.scktDriver = NewDriver(req.URL.Hostname(), port)
+	}
+
+	c.setDefaultTimeouts() // assinging default timeouts if not set already
+
+	if req.ctx != nil { // connect with the given context if context is set
+		if err := c.scktDriver.ConnectWithContext(*req.ctx); err != nil {
+			return nil, err
+		}
+	} else {
+		if err := c.scktDriver.Connect(); err != nil {
+			return nil, err
+		}
+	}
+
+	defer c.scktDriver.Close() // closing the socket connection
+
+	req.SetDefaultRequestHeaders() // assigning default headers if not set already
+
+	logDebug("The request headers: ")
+	dumpDebug(req.Header)
+
+	d, err := DumpRequest(req) // getting the byte representation of the ICAP request
+
+	if err != nil {
+		return nil, err
+	}
+
+	if err := c.scktDriver.Send(d); err != nil { // sending the entire TCP message of the ICAP client to the server connected
+		return nil, err
+	}
+
+	resp, err := c.scktDriver.Receive() // taking the response
+
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode == http.StatusContinue && !req.bodyFittedInPreview && req.previewSet { // this block suggests that the ICAP request contained preview body bytes and whole body did not fit in the preview, so the serber responded with 100 Continue and the client is to send the remaining body bytes only
+		logDebug("Making request for the rest of the remaining body bytes after preview, as received 100 Continue from the server...")
+		return c.DoRemaining(req)
+	}
+
+	return resp, nil
+}
+
+// DoRemaining requests an ICAP server with the remaining body bytes which did not fit in the preview in the original request
+func (c *Client) DoRemaining(req *Request) (*Response, error) {
+
+	data := req.remainingPreviewBytes
+
+	if !bodyAlreadyChunked(string(data)) { // if the body is not already chunke, then add the basic hexa body bytes notation
+		ds := string(data)
+		addHexaBodyByteNotations(&ds)
+		data = []byte(ds)
+	}
+
+	if err := c.scktDriver.Send(data); err != nil {
+		return nil, err
+	}
+
+	resp, err := c.scktDriver.Receive()
+
+	if err != nil {
+		return nil, err
+	}
+
+	return resp, nil
+}
+
+// SetDriver sets a new socket driver with the client
+func (c *Client) SetDriver(d *Driver) {
+	c.scktDriver = d
+}
+
+func (c *Client) setDefaultTimeouts() {
+	if c.Timeout == 0 {
+		c.Timeout = defaultTimeout
+	}
+
+	if c.scktDriver.DialerTimeout == 0 {
+		c.scktDriver.DialerTimeout = c.Timeout
+	}
+
+	if c.scktDriver.ReadTimeout == 0 {
+		c.scktDriver.ReadTimeout = c.Timeout
+	}
+
+	if c.scktDriver.WriteTimeout == 0 {
+		c.scktDriver.WriteTimeout = c.Timeout
+	}
+}

vendor/github.com/egirna/icap-client/consts.go

@@ -0,0 +1,57 @@
+package icapclient
+
+import "time"
+
+// the icap request methods
+const (
+	MethodOPTIONS = "OPTIONS"
+	MethodRESPMOD = "RESPMOD"
+	MethodREQMOD  = "REQMOD"
+)
+
+// the error messages
+const (
+	ErrInvalidScheme       = "the url scheme must be icap://"
+	ErrMethodNotRegistered = "the requested method is not registered"
+	ErrInvalidHost         = "the requested host is invalid"
+	ErrConnectionNotOpen   = "no open connection to close"
+	ErrInvalidTCPMsg       = "invalid tcp message"
+	ErrREQMODWithNoReq     = "http request cannot be nil for method REQMOD"
+	ErrREQMODWithResp      = "http response must be nil for method REQMOD"
+	ErrRESPMODWithNoResp   = "http response cannot be nil for method RESPMOD"
+)
+
+// general constants required for the package
+const (
+	SchemeICAP                      = "icap"
+	ICAPVersion                     = "ICAP/1.0"
+	HTTPVersion                     = "HTTP/1.1"
+	SchemeHTTPReq                   = "http_request"
+	SchemeHTTPResp                  = "http_response"
+	CRLF                            = "\r\n"
+	DoubleCRLF                      = "\r\n\r\n"
+	LF                              = "\n"
+	bodyEndIndicator                = CRLF + "0" + CRLF
+	fullBodyEndIndicatorPreviewMode = "; ieof" + DoubleCRLF
+	icap100ContinueMsg              = "ICAP/1.0 100 Continue" + DoubleCRLF
+	icap204NoModsMsg                = "ICAP/1.0 204 No modifications"
+	defaultChunkLength              = 512
+	defaultTimeout                  = 15 * time.Second
+)
+
+// Common ICAP headers
+const (
+	PreviewHeader          = "Preview"
+	MethodsHeader          = "Methods"
+	AllowHeader            = "Allow"
+	EncapsulatedHeader     = "Encapsulated"
+	TransferPreviewHeader  = "Transfer-Preview"
+	ServiceHeader          = "Service"
+	ISTagHeader            = "ISTag"
+	OptBodyTypeHeader      = "Opt-body-type"
+	MaxConnectionsHeader   = "Max-Connections"
+	OptionsTTLHeader       = "Options-TTL"
+	ServiceIDHeader        = "Service-ID"
+	TransferIgnoreHeader   = "Transfer-Ignore"
+	TransferCompleteHeader = "Transfer-Complete"
+)

vendor/github.com/egirna/icap-client/debug.go

@@ -0,0 +1,55 @@
+package icapclient
+
+import (
+	"io"
+	"log"
+	"os"
+
+	"github.com/davecgh/go-spew/spew"
+)
+
+// the debug mode determiner & the writer to the write the debug output to
+var (
+	DEBUG       = false
+	debugWriter io.Writer
+	logger      *log.Logger
+)
+
+const (
+	debugPrefix = "icap-client says: "
+)
+
+// SetDebugMode sets the debug mode for the entire package depending on the bool
+func SetDebugMode(debug bool) {
+	DEBUG = debug
+
+	if DEBUG { // setting os.Stdout as the default debug writer if debug mode is enabled & also the debug prefix
+		debugWriter = os.Stdout
+		logger = log.New(debugWriter, debugPrefix, log.LstdFlags)
+
+	}
+}
+
+// SetDebugOutput sets writer to write the debug outputs (default: os.Stdout)
+func SetDebugOutput(w io.Writer) {
+	debugWriter = w
+	logger.SetOutput(debugWriter)
+}
+
+func logDebug(a ...interface{}) {
+	if DEBUG {
+		logger.Println(a...)
+	}
+}
+
+func logfDebug(s string, a ...interface{}) {
+	if DEBUG {
+		logger.Printf(s, a...)
+	}
+}
+
+func dumpDebug(a ...interface{}) {
+	if DEBUG {
+		spew.Fdump(debugWriter, a...)
+	}
+}

vendor/github.com/egirna/icap-client/doc.go

@@ -0,0 +1,73 @@
+//Package icapclient is a client package for the ICAP protocol
+//
+// Here is a basic example:
+//  package main
+//
+//  import (
+// 	  "fmt"
+// 	  "log"
+// 	  "net/http"
+// 	  "time"
+//
+// 	  ic "github.com/egirna/icap-client"
+//  )
+//
+//  func main() {
+//   /* preparing the http request required for the RESPMOD */
+// 	 httpReq, err := http.NewRequest(http.MethodGet, "http://localhost:8000/sample.pdf", nil)
+//
+// 	 if err != nil {
+// 	  	log.Fatal(err)
+// 	 }
+//
+//   /* making the http client & making the request call to get the response needed for the icap RESPMOD call */
+// 	 httpClient := &http.Client{}
+//
+// 	 httpResp, err := httpClient.Do(httpReq)
+//
+// 	 if err != nil {
+// 		 log.Fatal(err)
+// 	 }
+//
+//   /* making a icap request with OPTIONS method */
+// 	 optReq, err := ic.NewRequest(ic.MethodOPTIONS, "icap://127.0.0.1:1344/respmod", nil, nil)
+//
+// 	 if err != nil {
+// 		 log.Fatal(err)
+// 		 return
+// 	 }
+//
+//   /* making the icap client responsible for making the requests */
+// 	 client := &ic.Client{
+// 		 Timeout: 5 * time.Second,
+// 	 }
+//
+//   /* making the OPTIONS request call */
+// 	 optResp, err := client.Do(optReq)
+//
+// 	 if err != nil {
+// 		 log.Fatal(err)
+// 		 return
+// 	 }
+//
+//   /* making a icap request with RESPMOD method */
+// 	 req, err := ic.NewRequest(ic.MethodRESPMOD, "icap://127.0.0.1:1344/respmod", httpReq, httpResp)
+//
+// 	 if err != nil {
+// 		 log.Fatal(err)
+// 	 }
+//
+// 	 req.SetPreview(optResp.PreviewBytes) // setting the preview bytes obtained from the OPTIONS call
+//
+//   /* making the RESPMOD request call */
+// 	 resp, err := client.Do(req)
+//
+// 	 if err != nil {
+// 		 log.Fatal(err)
+// 	 }
+//
+// 	 fmt.Println(resp.StatusCode)
+//
+//  }
+// See https://github.com/egirna/icap-client/examples.
+package icapclient

vendor/github.com/egirna/icap-client/driver.go

@@ -0,0 +1,99 @@
+package icapclient
+
+import (
+	"bufio"
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+)
+
+// Driver os the one responsible for driving the transport layer operations
+type Driver struct {
+	Host          string
+	Port          int
+	DialerTimeout time.Duration
+	ReadTimeout   time.Duration
+	WriteTimeout  time.Duration
+	tcp           *transport
+}
+
+// NewDriver is the factory function for Driver
+func NewDriver(host string, port int) *Driver {
+	return &Driver{
+		Host: host,
+		Port: port,
+	}
+}
+
+// Connect fires up a tcp socket connection with the icap server
+func (d *Driver) Connect() error {
+
+	d.tcp = &transport{
+		network:      "tcp",
+		addr:         fmt.Sprintf("%s:%d", d.Host, d.Port),
+		timeout:      d.DialerTimeout,
+		readTimeout:  d.ReadTimeout,
+		writeTimeout: d.WriteTimeout,
+	}
+
+	return d.tcp.dial()
+}
+
+// ConnectWithContext connects to the server satisfying the context
+func (d *Driver) ConnectWithContext(ctx context.Context) error {
+	d.tcp = &transport{
+		network:      "tcp",
+		addr:         fmt.Sprintf("%s:%d", d.Host, d.Port),
+		timeout:      d.DialerTimeout,
+		readTimeout:  d.ReadTimeout,
+		writeTimeout: d.WriteTimeout,
+	}
+
+	return d.tcp.dialWithContext(ctx)
+}
+
+// Close closes the socket connection
+func (d *Driver) Close() error {
+	if d.tcp == nil {
+
+		return errors.New(ErrConnectionNotOpen)
+	}
+
+	return d.tcp.close()
+}
+
+// Send sends a request to the icap server
+func (d *Driver) Send(data []byte) error {
+
+	_, err := d.tcp.write(data)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+
+}
+
+// Receive returns the respone from the tcp socket connection
+func (d *Driver) Receive() (*Response, error) {
+
+	msg, err := d.tcp.read()
+
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := ReadResponse(bufio.NewReader(strings.NewReader(msg)))
+
+	if err != nil {
+		return nil, err
+	}
+
+	logDebug("The final *ic.Response from tcp messages...")
+	dumpDebug(resp)
+
+	return resp, nil
+}

vendor/github.com/egirna/icap-client/header.go

@@ -0,0 +1,124 @@
+package icapclient
+
+import (
+	"bytes"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"strconv"
+)
+
+// SetPreview sets the preview bytes in the icap header
+func (r *Request) SetPreview(maxBytes int) error {
+
+	bodyBytes := []byte{}
+
+	previewBytes := 0
+
+	// receiving the body bites to determine the preview bytes depending on the request ICAP method
+
+	if r.Method == MethodREQMOD {
+		if r.HTTPRequest == nil {
+			return nil
+		}
+		if r.HTTPRequest.Body != nil {
+			var err error
+			bodyBytes, err = ioutil.ReadAll(r.HTTPRequest.Body)
+
+			if err != nil {
+				return err
+			}
+
+			defer r.HTTPRequest.Body.Close()
+		}
+	}
+
+	if r.Method == MethodRESPMOD {
+		if r.HTTPResponse == nil {
+			return nil
+		}
+
+		if r.HTTPResponse.Body != nil {
+			var err error
+			bodyBytes, err = ioutil.ReadAll(r.HTTPResponse.Body)
+
+			if err != nil {
+				return err
+			}
+
+			defer r.HTTPResponse.Body.Close()
+		}
+	}
+
+	previewBytes = len(bodyBytes)
+
+	if previewBytes > 0 { // if the preview byte is 0 or less, there is no question of the body fitting insides
+		r.bodyFittedInPreview = true
+	}
+
+	if previewBytes > maxBytes { // if the preview bytes is greater than what was mentioned by the ICAP Server(did not fit in the body)
+		previewBytes = maxBytes
+		r.bodyFittedInPreview = false
+		r.remainingPreviewBytes = bodyBytes[maxBytes:] // storing the rest of the body byte which were not sent as preview for further operations
+	}
+
+	// returning the body back to the http message depending on the request method
+
+	if r.Method == MethodREQMOD {
+		r.HTTPRequest.Body = ioutil.NopCloser(bytes.NewReader(bodyBytes))
+	}
+
+	if r.Method == MethodRESPMOD {
+		r.HTTPResponse.Body = ioutil.NopCloser(bytes.NewReader(bodyBytes))
+	}
+
+	// finally assinging the preview informations including setting the header
+
+	r.Header.Set("Preview", strconv.Itoa(previewBytes))
+	r.PreviewBytes = previewBytes
+	r.previewSet = true
+
+	return nil
+
+}
+
+// SetDefaultRequestHeaders assigns some of the headers with its default value if they are not set already
+func (r *Request) SetDefaultRequestHeaders() {
+	if _, exists := r.Header["Allow"]; !exists {
+		r.Header.Add("Allow", "204") // assigning 204 by default if Allow not provided
+	}
+	if _, exists := r.Header["Host"]; !exists {
+		hostName, _ := os.Hostname()
+		r.Header.Add("Host", hostName)
+	}
+}
+
+// ExtendHeader extends the current ICAP Request header with a new header
+func (r *Request) ExtendHeader(hdr http.Header) error {
+	for header, values := range hdr {
+
+		if header == PreviewHeader && r.previewSet {
+			continue
+		}
+
+		if header == EncapsulatedHeader {
+			continue
+		}
+
+		for _, value := range values {
+			if header == PreviewHeader {
+				pb, err := strconv.Atoi(value)
+				if err != nil {
+					return err
+				}
+				if err := r.SetPreview(pb); err != nil {
+					return err
+				}
+				continue
+			}
+			r.Header.Add(header, value)
+		}
+	}
+
+	return nil
+}

vendor/github.com/egirna/icap-client/methods.go

@@ -0,0 +1,9 @@
+package icapclient
+
+var (
+	registeredMethods = map[string]bool{
+		MethodOPTIONS: true,
+		MethodRESPMOD: true,
+		MethodREQMOD:  true,
+	}
+)

vendor/github.com/egirna/icap-client/parser.go

@@ -0,0 +1,179 @@
+package icapclient
+
+import (
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// getStatusWithCode prepares the status code and status text from two given strings
+func getStatusWithCode(str1, str2 string) (int, string, error) {
+
+	statusCode, err := strconv.Atoi(str1)
+
+	if err != nil {
+		return 0, "", err
+	}
+
+	status := strings.TrimSpace(str2)
+
+	return statusCode, status, nil
+}
+
+// getHeaderVal parses the header and its value from a tcp message string
+func getHeaderVal(str string) (string, string) {
+
+	headerVals := strings.SplitN(str, ":", 2)
+	header := headerVals[0]
+	val := ""
+
+	if len(headerVals) >= 2 {
+		val = strings.TrimSpace(headerVals[1])
+	}
+
+	return header, val
+
+}
+
+// isRequestLine determines if the tcp message string is a request line, i.e the first line of the message or not
+func isRequestLine(str string) bool {
+	return strings.Contains(str, ICAPVersion) || strings.Contains(str, HTTPVersion)
+}
+
+// setEncapsulatedHeaderValue generates the Encapsulated  values and assigns to the ICAP request string
+func setEncapsulatedHeaderValue(icapReqStr *string, httpReqStr, httpRespStr string) {
+	encpVal := " "
+
+	if strings.HasPrefix(*icapReqStr, MethodOPTIONS) { // if the request method is OPTIONS
+		if httpReqStr == "" && httpRespStr == "" { // the most common case for OPTIONS method, no Encapsulated body
+			encpVal += "null-body=0"
+		} else {
+			encpVal += "opt-body=0" // if there is an Encapsulated body
+		}
+	}
+
+	if strings.HasPrefix(*icapReqStr, MethodREQMOD) || strings.HasPrefix(*icapReqStr, MethodRESPMOD) { // if the request method is RESPMOD or REQMOD
+		re := regexp.MustCompile(DoubleCRLF)                // looking for the match of the string \r\n\r\n, as that is the expression that seperates each blocks, i.e headers and bodies
+		reqIndices := re.FindAllStringIndex(httpReqStr, -1) // getting the offsets of the matches, tells us the starting/ending point of headers and bodies
+
+		reqEndsAt := 0 // this is needed to calculate the response headers by adding the last offset of the request block
+		if reqIndices != nil {
+			encpVal += "req-hdr=0"
+			reqEndsAt = reqIndices[0][1]
+			if len(reqIndices) > 1 { // indicating there is a body present for the request block, as length would have been 1 for a single match of \r\n\r\n
+				encpVal += fmt.Sprintf(", req-body=%d", reqIndices[0][1]) // assigning the starting point of the body
+				reqEndsAt = reqIndices[1][1]
+			} else if httpRespStr == "" {
+				encpVal += fmt.Sprintf(", null-body=%d", reqIndices[0][1])
+			}
+			if httpRespStr != "" {
+				encpVal += ", "
+			}
+		}
+
+		respIndices := re.FindAllStringIndex(httpRespStr, -1)
+
+		if respIndices != nil {
+			encpVal += fmt.Sprintf("res-hdr=%d", reqEndsAt)
+			if len(respIndices) > 1 {
+				encpVal += fmt.Sprintf(", res-body=%d", reqEndsAt+respIndices[0][1])
+			} else {
+				encpVal += fmt.Sprintf(", null-body=%d", reqEndsAt+respIndices[0][1])
+			}
+		}
+
+	}
+
+	*icapReqStr = fmt.Sprintf(*icapReqStr, encpVal) // formatting the ICAP request Encapsulated header with the value
+}
+
+// replaceRequestURIWithActualURL replaces the just the escaped portion of the url with the entire URL in the dumped request message
+func replaceRequestURIWithActualURL(str *string, uri, url string) {
+	if uri == "" {
+		uri = "/"
+	}
+	*str = strings.Replace(*str, uri, url, 1)
+}
+
+// addFullBodyInPreviewIndicator adds 0; ieof\r\n\r\n which indicates the entire body fitted in preview
+func addFullBodyInPreviewIndicator(str *string) {
+	*str = strings.TrimSuffix(*str, DoubleCRLF)
+	*str += fullBodyEndIndicatorPreviewMode
+}
+
+// splitBodyAndHeader separates header and body from a http message
+func splitBodyAndHeader(str string) (string, string, bool) {
+	ss := strings.SplitN(str, DoubleCRLF, 2)
+
+	if len(ss) < 2 || ss[1] == "" {
+		return "", "", false
+	}
+
+	headerStr := ss[0]
+	bodyStr := ss[1]
+
+	return headerStr, bodyStr, true
+}
+
+// bodyAlreadyChunked determines if the http body is already chunked from the origin server or not
+func bodyAlreadyChunked(str string) bool {
+	_, bodyStr, ok := splitBodyAndHeader(str)
+
+	if !ok {
+		return false
+	}
+
+	r := regexp.MustCompile("\\r\\n0(\\r\\n)+$")
+	return r.MatchString(bodyStr)
+
+}
+
+// parsePreviewBodyBytes parses the preview portion of the body and only keeps that in the message
+func parsePreviewBodyBytes(str *string, pb int) {
+
+	headerStr, bodyStr, ok := splitBodyAndHeader(*str)
+
+	if !ok {
+		return
+	}
+
+	bodyStr = bodyStr[:pb]
+
+	*str = headerStr + DoubleCRLF + bodyStr
+}
+
+// addHexaBodyByteNotations adds the hexadecimal byte notaions in the messages
+// for example: Hello World, becomes
+// b
+// Hello World
+// 0
+func addHexaBodyByteNotations(bodyStr *string) {
+
+	bodyBytes := []byte(*bodyStr)
+
+	*bodyStr = fmt.Sprintf("%x%s%s%s", len(bodyBytes), CRLF, *bodyStr, bodyEndIndicator)
+}
+
+// mergeHeaderAndBody merges the header and body of the http message togather
+func mergeHeaderAndBody(src *string, headerStr, bodyStr string) {
+	*src = headerStr + DoubleCRLF + bodyStr
+}
+
+func chunkBodyByBytes(bdyByte []byte, cl int) []byte {
+
+	newBytes := []byte{}
+
+	for i := 0; i < len(bdyByte); i += cl {
+		end := i + cl
+		if end > len(bdyByte) {
+			end = len(bdyByte)
+		}
+
+		newBytes = append(newBytes, []byte(fmt.Sprintf("%x\r\n", len(bdyByte[i:end]))+string(bdyByte[i:end]))...)
+	}
+
+	newBytes = append(newBytes, []byte(bodyEndIndicator)...)
+
+	return newBytes
+}

vendor/github.com/egirna/icap-client/request.go

@@ -0,0 +1,160 @@
+package icapclient
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"strings"
+)
+
+// Request represents the icap client request data
+type Request struct {
+	Method                string
+	URL                   *url.URL
+	Header                http.Header
+	HTTPRequest           *http.Request
+	HTTPResponse          *http.Response
+	ChunkLength           int
+	PreviewBytes          int
+	ctx                   *context.Context
+	previewSet            bool
+	bodyFittedInPreview   bool
+	remainingPreviewBytes []byte
+}
+
+// NewRequest is the factory function for Request
+func NewRequest(method, urlStr string, httpReq *http.Request, httpResp *http.Response) (*Request, error) {
+
+	method = strings.ToUpper(method)
+
+	u, err := url.Parse(urlStr)
+
+	if err != nil {
+		return nil, err
+	}
+
+	req := &Request{
+		Method:       method,
+		URL:          u,
+		Header:       make(map[string][]string),
+		HTTPRequest:  httpReq,
+		HTTPResponse: httpResp,
+	}
+
+	if err := req.Validate(); err != nil {
+		return nil, err
+	}
+
+	return req, nil
+}
+
+// DumpRequest returns the given request in its ICAP/1.x wire
+// representation.
+func DumpRequest(req *Request) ([]byte, error) {
+
+	// Making the ICAP message block
+
+	reqStr := fmt.Sprintf("%s %s %s%s", req.Method, req.URL.String(), ICAPVersion, CRLF)
+
+	for headerName, vals := range req.Header {
+		for _, val := range vals {
+			reqStr += fmt.Sprintf("%s: %s%s", headerName, val, CRLF)
+		}
+	}
+
+	reqStr += "Encapsulated: %s" + CRLF // will populate the Encapsulated header value after making the http Request & Response messages
+	reqStr += CRLF
+
+	// Making the HTTP Request message block
+
+	httpReqStr := ""
+	if req.HTTPRequest != nil {
+		b, err := httputil.DumpRequestOut(req.HTTPRequest, true)
+
+		if err != nil {
+			return nil, err
+		}
+
+		httpReqStr += string(b)
+		replaceRequestURIWithActualURL(&httpReqStr, req.HTTPRequest.URL.EscapedPath(), req.HTTPRequest.URL.String())
+
+		if req.Method == MethodREQMOD {
+			if req.previewSet {
+				parsePreviewBodyBytes(&httpReqStr, req.PreviewBytes)
+			}
+
+			if !bodyAlreadyChunked(httpReqStr) {
+				headerStr, bodyStr, ok := splitBodyAndHeader(httpReqStr)
+				if ok {
+					addHexaBodyByteNotations(&bodyStr)
+					mergeHeaderAndBody(&httpReqStr, headerStr, bodyStr)
+				}
+			}
+
+		}
+
+		if httpReqStr != "" { // if the HTTP Request message block doesn't end with a \r\n\r\n, then going to add one by force for better calculation of byte offsets
+			for !strings.HasSuffix(httpReqStr, DoubleCRLF) {
+				httpReqStr += CRLF
+			}
+		}
+
+	}
+
+	// Making the HTTP Response message block
+
+	httpRespStr := ""
+	if req.HTTPResponse != nil {
+		b, err := httputil.DumpResponse(req.HTTPResponse, true)
+
+		if err != nil {
+			return nil, err
+		}
+
+		httpRespStr += string(b)
+
+		if req.previewSet {
+			parsePreviewBodyBytes(&httpRespStr, req.PreviewBytes)
+		}
+
+		if !bodyAlreadyChunked(httpRespStr) {
+			headerStr, bodyStr, ok := splitBodyAndHeader(httpRespStr)
+			if ok {
+				addHexaBodyByteNotations(&bodyStr)
+				mergeHeaderAndBody(&httpRespStr, headerStr, bodyStr)
+			}
+		}
+
+		if httpRespStr != "" && !strings.HasSuffix(httpRespStr, DoubleCRLF) { // if the HTTP Response message block doesn't end with a \r\n\r\n, then going to add one by force for better calculation of byte offsets
+			httpRespStr += CRLF
+		}
+
+	}
+
+	if encpVal := req.Header.Get(EncapsulatedHeader); encpVal != "" {
+		reqStr = fmt.Sprintf(reqStr, encpVal)
+	} else {
+		//populating the Encapsulated header of the ICAP message portion
+		setEncapsulatedHeaderValue(&reqStr, httpReqStr, httpRespStr)
+	}
+
+	// determining if the http message needs the full body fitted in the preview portion indicator or not
+	if httpRespStr != "" && req.previewSet && req.bodyFittedInPreview {
+		addFullBodyInPreviewIndicator(&httpRespStr)
+	}
+
+	if req.Method == MethodREQMOD && req.previewSet && req.bodyFittedInPreview {
+		addFullBodyInPreviewIndicator(&httpReqStr)
+	}
+
+	data := []byte(reqStr + httpReqStr + httpRespStr)
+
+	return data, nil
+}
+
+// SetContext sets a context for the ICAP request
+func (r *Request) SetContext(ctx context.Context) { // TODO: make context take control over the whole operation
+	r.ctx = &ctx
+}

vendor/github.com/egirna/icap-client/response.go

@@ -0,0 +1,123 @@
+package icapclient
+
+import (
+	"bufio"
+	"errors"
+	"net/http"
+	"strconv"
+	"strings"
+)
+
+// Response represents the icap server response data
+type Response struct {
+	StatusCode      int
+	Status          string
+	PreviewBytes    int
+	Header          http.Header
+	ContentRequest  *http.Request
+	ContentResponse *http.Response
+}
+
+var (
+	optionValues = map[string]bool{
+		PreviewHeader:          true,
+		MethodsHeader:          true,
+		AllowHeader:            true,
+		TransferPreviewHeader:  true,
+		ServiceHeader:          true,
+		ISTagHeader:            true,
+		OptBodyTypeHeader:      true,
+		MaxConnectionsHeader:   true,
+		OptionsTTLHeader:       true,
+		ServiceIDHeader:        true,
+		TransferIgnoreHeader:   true,
+		TransferCompleteHeader: true,
+	}
+)
+
+// ReadResponse converts a Reader to a icapclient Response
+func ReadResponse(b *bufio.Reader) (*Response, error) {
+
+	resp := &Response{
+		Header: make(map[string][]string),
+	}
+
+	scheme := ""
+	httpMsg := ""
+	for currentMsg, err := b.ReadString('\n'); err == nil || currentMsg != ""; currentMsg, err = b.ReadString('\n') { // keep reading the buffer message which is the http response message
+
+		if isRequestLine(currentMsg) { // if the current message line if the first line of the message portion(request line)
+			ss := strings.Split(currentMsg, " ")
+
+			if len(ss) < 3 { // must contain 3 words, for example: "ICAP/1.0 200 OK" or "GET /something HTTP/1.1"
+				return nil, errors.New(ErrInvalidTCPMsg + ":" + currentMsg)
+			}
+
+			// preparing the scheme below
+
+			if ss[0] == ICAPVersion {
+				scheme = SchemeICAP
+				resp.StatusCode, resp.Status, err = getStatusWithCode(ss[1], strings.Join(ss[2:], " "))
+				if err != nil {
+					return nil, err
+				}
+				continue
+			}
+
+			if ss[0] == HTTPVersion {
+				scheme = SchemeHTTPResp
+				httpMsg = ""
+			}
+
+			if strings.TrimSpace(ss[2]) == HTTPVersion { // for a http request message if the scheme version is always at last, for example: GET /something HTTP/1.1
+				scheme = SchemeHTTPReq
+				httpMsg = ""
+			}
+		}
+
+		// preparing the header for ICAP & contents for HTTP messages below
+
+		if scheme == SchemeICAP {
+			if currentMsg == LF || currentMsg == CRLF { // don't want to count the Line Feed as header
+				continue
+			}
+			header, val := getHeaderVal(currentMsg)
+			if header == PreviewHeader {
+				pb, _ := strconv.Atoi(val)
+				resp.PreviewBytes = pb
+			}
+			resp.Header.Add(header, val)
+		}
+
+		if scheme == SchemeHTTPReq {
+			httpMsg += strings.TrimSpace(currentMsg) + CRLF
+			bufferEmpty := b.Buffered() == 0
+			if currentMsg == CRLF || bufferEmpty { // a CRLF indicates the end of a http message and the buffer check is just in case the buffer eneded with one last message instead of a CRLF
+				var erR error
+				resp.ContentRequest, erR = http.ReadRequest(bufio.NewReader(strings.NewReader(httpMsg)))
+				if erR != nil {
+					return nil, erR
+				}
+				continue
+			}
+		}
+
+		if scheme == SchemeHTTPResp {
+			httpMsg += strings.TrimSpace(currentMsg) + CRLF
+			bufferEmpty := b.Buffered() == 0
+			if currentMsg == CRLF || bufferEmpty {
+				var erR error
+				resp.ContentResponse, erR = http.ReadResponse(bufio.NewReader(strings.NewReader(httpMsg)), resp.ContentRequest)
+				if erR != nil {
+					return nil, erR
+				}
+				continue
+			}
+
+		}
+
+	}
+
+	return resp, nil
+
+}

vendor/github.com/egirna/icap-client/test_server.go

@@ -0,0 +1,152 @@
+package icapclient
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"os/signal"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/egirna/icap"
+)
+
+var (
+	stop = make(chan os.Signal, 1)
+	port = 1344
+)
+
+const (
+	previewBytes      = 24
+	goodFileDetectStr = "GOOD FILE"
+	badFileDetectStr  = "BAD FILE"
+	goodURL           = "http://goodifle.com"
+	badURL            = "http://badfile.com"
+)
+
+func startTestServer() {
+	icap.HandleFunc("/respmod", respmodHandler)
+	icap.HandleFunc("/reqmod", reqmodHandler)
+
+	log.Println("Starting ICAP test server...")
+
+	signal.Notify(stop, syscall.SIGKILL, syscall.SIGINT, syscall.SIGQUIT)
+
+	go func() {
+		if err := icap.ListenAndServe(fmt.Sprintf(":%d", port), nil); err != nil {
+			log.Println("Failed to start ICAP test server: ", err.Error())
+			return
+		}
+	}()
+
+	time.Sleep(5 * time.Millisecond)
+
+	log.Printf("ICAP test server is running on localhost:%d\n...\n", port)
+	<-stop
+
+	log.Println("ICAP test server is shut down!")
+}
+
+func stopTestServer() {
+	stop <- syscall.SIGKILL
+}
+
+func respmodHandler(w icap.ResponseWriter, req *icap.Request) {
+	h := w.Header()
+	h.Set("ISTag", "ICAP-TEST")
+	h.Set("Service", "ICAP-TEST-SERVICE")
+
+	switch req.Method {
+	case "OPTIONS":
+		h.Set("Methods", "RESPMOD")
+		h.Set("Allow", "204")
+		if previewBytes > 0 {
+			h.Set("Preview", strconv.Itoa(previewBytes))
+		}
+		h.Set("Transfer-Preview", "*")
+		w.WriteHeader(http.StatusOK, nil, false)
+	case "RESPMOD":
+		defer req.Response.Body.Close()
+
+		if val, exist := req.Header["Allow"]; !exist || (len(val) > 0 && val[0] != "204") {
+			w.WriteHeader(http.StatusNoContent, nil, false)
+			return
+		}
+
+		// log.Println("The preview data: ", string(req.Preview))
+
+		buf := &bytes.Buffer{}
+
+		if _, err := io.Copy(buf, req.Response.Body); err != nil {
+			log.Println("Failed to copy the response body to buffer: ", err.Error())
+			w.WriteHeader(http.StatusNoContent, nil, false)
+			return
+		}
+
+		status := 0
+		if strings.Contains(buf.String(), goodFileDetectStr) {
+			status = http.StatusNoContent
+		}
+
+		if strings.Contains(buf.String(), badFileDetectStr) {
+			status = http.StatusOK
+		}
+
+		w.WriteHeader(status, nil, false)
+
+	}
+}
+
+func reqmodHandler(w icap.ResponseWriter, req *icap.Request) {
+	h := w.Header()
+	h.Set("ISTag", "ICAP-TEST")
+	h.Set("Service", "ICAP-TEST-SERVICE")
+
+	switch req.Method {
+	case "OPTIONS":
+		h.Set("Methods", "REQMOD")
+		h.Set("Allow", "204")
+		if previewBytes > 0 {
+			h.Set("Preview", strconv.Itoa(previewBytes))
+		}
+		h.Set("Transfer-Preview", "*")
+		w.WriteHeader(http.StatusOK, nil, false)
+	case "REQMOD":
+
+		if val, exist := req.Header["Allow"]; !exist || (len(val) > 0 && val[0] != "204") {
+			w.WriteHeader(http.StatusNoContent, nil, false)
+			return
+		}
+
+		// log.Println("The preview data: ", string(req.Preview))
+
+		fileURL := req.Request.RequestURI
+
+		status := 0
+		if fileURL == goodURL {
+			status = http.StatusNoContent
+		}
+
+		if fileURL == badURL {
+			status = http.StatusOK
+		}
+
+		w.WriteHeader(status, nil, false)
+
+	}
+}
+
+func testServerRunning() bool {
+	lstnr, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
+	if err != nil {
+		return true
+	}
+	lstnr.Close()
+	return false
+}

vendor/github.com/egirna/icap-client/transport.go

@@ -0,0 +1,123 @@
+package icapclient
+
+import (
+	"context"
+	"io"
+	"net"
+	"strings"
+	"time"
+)
+
+// transport represents the transport layer data
+type transport struct {
+	network      string
+	addr         string
+	timeout      time.Duration
+	readTimeout  time.Duration
+	writeTimeout time.Duration
+	sckt         net.Conn
+}
+
+// dial fires up a tcp socket
+func (t *transport) dial() error {
+	sckt, err := net.DialTimeout(t.network, t.addr, t.timeout)
+
+	if err != nil {
+		return err
+	}
+
+	if err := sckt.SetReadDeadline(time.Now().UTC().Add(t.readTimeout)); err != nil {
+		return err
+	}
+
+	if err := sckt.SetWriteDeadline(time.Now().UTC().Add(t.writeTimeout)); err != nil {
+		return err
+	}
+
+	t.sckt = sckt
+
+	return nil
+}
+
+// dialWithContext fires up a tcp socket
+func (t *transport) dialWithContext(ctx context.Context) error {
+	sckt, err := (&net.Dialer{
+		Timeout: t.timeout,
+	}).DialContext(ctx, t.network, t.addr)
+
+	if err != nil {
+		return err
+	}
+
+	if err := sckt.SetReadDeadline(time.Now().UTC().Add(t.readTimeout)); err != nil {
+		return err
+	}
+
+	if err := sckt.SetWriteDeadline(time.Now().UTC().Add(t.writeTimeout)); err != nil {
+		return err
+	}
+
+	t.sckt = sckt
+
+	return nil
+}
+
+// Write writes data to the server
+func (t *transport) write(data []byte) (int, error) {
+	logDebug("Dumping the message being sent to the server...")
+	dumpDebug(string(data))
+	return t.sckt.Write(data)
+}
+
+// Read reads data from server
+func (t *transport) read() (string, error) {
+
+	data := make([]byte, 0)
+
+	logDebug("Dumping messages received from the server...")
+
+	for {
+		tmp := make([]byte, 1096)
+
+		n, err := t.sckt.Read(tmp)
+
+		if err != nil {
+			if err == io.EOF {
+				logDebug("End of file detected from EOF error")
+				break
+			}
+			return "", err
+		}
+
+		if n == 0 {
+			logDebug("End of file detected by 0 bytes")
+			break
+		}
+
+		data = append(data, tmp[:n]...)
+		if string(data) == icap100ContinueMsg { // explicitly breaking because the Read blocks for 100 continue message // TODO: find out why
+			logDebug("Stopping because got 100 Continue from the server")
+			break
+		}
+
+		if strings.HasSuffix(string(data), "0\r\n\r\n") {
+			logDebug("End of the file detected by 0 Double CRLF indicator")
+			break
+		}
+
+		if strings.Contains(string(data), icap204NoModsMsg) {
+			logDebug("End of file detected by 204 no modifications and Double CRLF at the end")
+			break
+		}
+
+		dumpDebug(string(tmp))
+
+	}
+
+	return string(data), nil
+}
+
+// close closes the tcp connection
+func (t *transport) close() error {
+	return t.sckt.Close()
+}

vendor/github.com/egirna/icap-client/validate.go

@@ -0,0 +1,63 @@
+package icapclient
+
+import (
+	"errors"
+	"net/http"
+	"net/url"
+)
+
+// validMethod validates the ICAP method
+func validMethod(method string) (bool, error) {
+	if _, registered := registeredMethods[method]; !registered {
+		return false, errors.New(ErrMethodNotRegistered)
+	}
+
+	return true, nil
+}
+
+// validURL validates the Server URL provided
+func validURL(url *url.URL) (bool, error) {
+
+	if url.Scheme != SchemeICAP {
+		return false, errors.New(ErrInvalidScheme)
+	}
+
+	if url.Host == "" {
+		return false, errors.New(ErrInvalidHost)
+	}
+
+	return true, nil
+}
+
+// validMethodWithHTTP validates if the ICAP request method and the http messages are alligned or not
+func validMethodWithHTTP(httpReq *http.Request, httpResp *http.Response, method string) (bool, error) {
+	if method == MethodREQMOD && httpReq == nil {
+		return false, errors.New(ErrREQMODWithNoReq)
+	}
+	if method == MethodREQMOD && httpResp != nil {
+		return false, errors.New(ErrREQMODWithResp)
+	}
+	if method == MethodRESPMOD && httpResp == nil {
+		return false, errors.New(ErrRESPMODWithNoResp)
+	}
+
+	return true, nil
+}
+
+// Validate validates the ICAP request
+func (r *Request) Validate() error {
+
+	if valid, err := validMethod(r.Method); !valid {
+		return err
+	}
+
+	if valid, err := validURL(r.URL); !valid {
+		return err
+	}
+
+	if valid, err := validMethodWithHTTP(r.HTTPRequest, r.HTTPResponse, r.Method); !valid {
+		return err
+	}
+
+	return nil
+}

vendor/github.com/egirna/icap/.hgignore

@@ -0,0 +1,7 @@
+~$
+\.swp$
+\.[568]$
+\.out$
+^_
+\.orig$
+example/example

vendor/github.com/egirna/icap/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2018, Eliezer Croitoru NgTech LTD
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of go-icap nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/egirna/icap/bridge.go

@@ -0,0 +1,77 @@
+// Copyright 2011 Andy Balholm. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// A bridge between ICAP and HTTP.
+// It allows answering a REQMOD request with an HTTP response generated locally.
+
+package icap
+
+import (
+	"log"
+	"net/http"
+	"time"
+)
+
+type bridgedRespWriter struct {
+	irw         ResponseWriter // the underlying icap.ResponseWriter
+	header      http.Header    // the headers for the HTTP response
+	wroteHeader bool           // Have the headers been written yet?
+}
+
+func (w *bridgedRespWriter) Header() http.Header {
+	return w.header
+}
+
+func (w *bridgedRespWriter) Write(p []byte) (n int, err error) {
+	if !w.wroteHeader {
+		w.WriteHeader(http.StatusOK)
+	}
+
+	return w.irw.Write(p)
+}
+
+func (w *bridgedRespWriter) WriteHeader(code int) {
+	if w.wroteHeader {
+		log.Print("http: multiple response.WriteHeader calls")
+		return
+	}
+
+	w.wroteHeader = true
+
+	// Default output is HTML encoded in UTF-8.
+	if w.header.Get("Content-Type") == "" {
+		w.header.Set("Content-Type", "text/html; charset=utf-8")
+	}
+
+	if _, ok := w.header["Date"]; !ok {
+		w.Header().Set("Date", time.Now().UTC().Format(http.TimeFormat))
+	}
+
+	resp := new(http.Response)
+	resp.StatusCode = code
+	resp.Header = w.header
+
+	w.irw.WriteHeader(200, resp, true)
+}
+
+// NewBridgedResponseWriter Create an http.ResponseWriter that encapsulates its response in an ICAP response.
+func NewBridgedResponseWriter(w ResponseWriter) http.ResponseWriter {
+	rw := new(bridgedRespWriter)
+	rw.header = make(http.Header)
+	rw.irw = w
+
+	return rw
+}
+
+// ServeLocally Pass use the local HTTP server to generate a response for an ICAP request.
+func ServeLocally(w ResponseWriter, req *Request) {
+	brw := NewBridgedResponseWriter(w)
+	http.DefaultServeMux.ServeHTTP(brw, req.Request)
+}
+
+// ServeLocallyFromHandler ---
+func ServeLocallyFromHandler(w ResponseWriter, req *Request, mux http.Handler) {
+	brw := NewBridgedResponseWriter(w)
+	mux.ServeHTTP(brw, req.Request)
+}

vendor/github.com/egirna/icap/chunked.go

@@ -0,0 +1,181 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The wire protocol for HTTP's "chunked" Transfer-Encoding.
+// This code is derived from the standard library's http/httputil/chunked.go,
+
+package icap
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+)
+
+const maxLineLength = 4096 // assumed <= bufio.defaultBufSize
+
+var errLineTooLong = errors.New("header line too long")
+
+// NewChunkedReader returns a new chunkedReader that translates the data read from r
+// out of HTTP "chunked" format before returning it.
+// The chunkedReader returns io.EOF when the final 0-length chunk is read.
+//
+// NewChunkedReader is not needed by normal applications. The http package
+// automatically decodes chunking when reading response bodies.
+func newChunkedReader(r io.Reader) io.Reader {
+	br, ok := r.(*bufio.Reader)
+	if !ok {
+		br = bufio.NewReader(r)
+	}
+	return &chunkedReader{r: br}
+}
+
+type chunkedReader struct {
+	r   *bufio.Reader
+	n   uint64 // unread bytes in chunk
+	err error
+	buf [2]byte
+}
+
+func (cr *chunkedReader) beginChunk() {
+	// chunk-size CRLF
+	var line []byte
+	line, cr.err = readLine(cr.r)
+	if cr.err != nil {
+		return
+	}
+	cr.n, cr.err = parseHexUint(line)
+	if cr.err != nil {
+		return
+	}
+	if cr.n == 0 {
+		cr.err = io.EOF
+	}
+}
+
+func (cr *chunkedReader) Read(b []uint8) (n int, err error) {
+	if cr.err != nil {
+		return 0, cr.err
+	}
+	if cr.n == 0 {
+		cr.beginChunk()
+		if cr.err != nil {
+			return 0, cr.err
+		}
+	}
+	if uint64(len(b)) > cr.n {
+		b = b[0:cr.n]
+	}
+	n, cr.err = cr.r.Read(b)
+	cr.n -= uint64(n)
+	if cr.n == 0 && cr.err == nil {
+		// end of chunk (CRLF)
+		if _, cr.err = io.ReadFull(cr.r, cr.buf[:]); cr.err == nil {
+			if cr.buf[0] != '\r' || cr.buf[1] != '\n' {
+				cr.err = errors.New("malformed chunked encoding")
+			}
+		}
+	}
+	return n, cr.err
+}
+
+// Read a line of bytes (up to \n) from b.
+// Give up if the line exceeds maxLineLength.
+// The returned bytes are a pointer into storage in
+// the bufio, so they are only valid until the next bufio read.
+func readLine(b *bufio.Reader) (p []byte, err error) {
+	if p, err = b.ReadSlice('\n'); err != nil {
+		// We always know when EOF is coming.
+		// If the caller asked for a line, there should be a line.
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		} else if err == bufio.ErrBufferFull {
+			err = errLineTooLong
+		}
+		return nil, err
+	}
+	if len(p) >= maxLineLength {
+		return nil, errLineTooLong
+	}
+	return trimTrailingWhitespace(p), nil
+}
+
+func trimTrailingWhitespace(b []byte) []byte {
+	for len(b) > 0 && isASCIISpace(b[len(b)-1]) {
+		b = b[:len(b)-1]
+	}
+	return b
+}
+
+func isASCIISpace(b byte) bool {
+	return b == ' ' || b == '\t' || b == '\n' || b == '\r'
+}
+
+// NewChunkedWriter returns a new chunkedWriter that translates writes into HTTP
+// "chunked" format before writing them to w. Closing the returned chunkedWriter
+// sends the final 0-length chunk that marks the end of the stream.
+//
+// NewChunkedWriter is not needed by normal applications. The http
+// package adds chunking automatically if handlers don't set a
+// Content-Length header. Using NewChunkedWriter inside a handler
+// would result in double chunking or chunking with a Content-Length
+// length, both of which are wrong.
+func NewChunkedWriter(w io.Writer) io.WriteCloser {
+	return &chunkedWriter{w}
+}
+
+// Writing to chunkedWriter translates to writing in HTTP chunked Transfer
+// Encoding wire format to the underlying Wire chunkedWriter.
+type chunkedWriter struct {
+	Wire io.Writer
+}
+
+// Write the contents of data as one chunk to Wire.
+// NOTE: Note that the corresponding chunk-writing procedure in Conn.Write has
+// a bug since it does not check for success of io.WriteString
+func (cw *chunkedWriter) Write(data []byte) (n int, err error) {
+
+	// Don't send 0-length data. It looks like EOF for chunked encoding.
+	if len(data) == 0 {
+		return 0, nil
+	}
+
+	if _, err = fmt.Fprintf(cw.Wire, "%x\r\n", len(data)); err != nil {
+		return 0, err
+	}
+	if n, err = cw.Wire.Write(data); err != nil {
+		return
+	}
+	if n != len(data) {
+		err = io.ErrShortWrite
+		return
+	}
+	_, err = io.WriteString(cw.Wire, "\r\n")
+
+	return
+}
+
+func (cw *chunkedWriter) Close() error {
+	_, err := io.WriteString(cw.Wire, "0\r\n")
+	return err
+}
+
+func parseHexUint(v []byte) (n uint64, err error) {
+	for _, b := range v {
+		n <<= 4
+		switch {
+		case '0' <= b && b <= '9':
+			b = b - '0'
+		case 'a' <= b && b <= 'f':
+			b = b - 'a' + 10
+		case 'A' <= b && b <= 'F':
+			b = b - 'A' + 10
+		default:
+			return 0, fmt.Errorf("invalid chunk length: '%s'", v)
+		}
+		n |= uint64(b)
+	}
+	return
+}

vendor/github.com/egirna/icap/mux.go

@@ -0,0 +1,193 @@
+// Copyright 2011 Andy Balholm. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icap
+
+import (
+	"net/http"
+	"net/url"
+	"path"
+	"strings"
+)
+
+// ServeMux is an ICAP request multiplexer.
+// It matches the URL of each incoming request against a list of registered
+// patterns and calls the handler for the pattern that
+// most closely matches the URL.
+//
+// For more details, see the documentation for http.ServeMux
+type ServeMux struct {
+	m map[string]Handler
+}
+
+// NewServeMux allocates and returns a new ServeMux.
+func NewServeMux() *ServeMux { return &ServeMux{make(map[string]Handler)} }
+
+// DefaultServeMux is the default ServeMux used by Serve.
+var DefaultServeMux = NewServeMux()
+
+// Does path match pattern?
+func pathMatch(pattern, path string) bool {
+	if len(pattern) == 0 {
+		// should not happen
+		return false
+	}
+	n := len(pattern)
+	if pattern[n-1] != '/' {
+		return pattern == path
+	}
+	return len(path) >= n && path[0:n] == pattern
+}
+
+// Return the canonical path for p, eliminating . and .. elements.
+func cleanPath(p string) string {
+	if p == "" {
+		return "/"
+	}
+	if p[0] != '/' {
+		p = "/" + p
+	}
+	np := path.Clean(p)
+	// path.Clean removes trailing slash except for root;
+	// put the trailing slash back if necessary.
+	if p[len(p)-1] == '/' && np != "/" {
+		np += "/"
+	}
+	return np
+}
+
+// Find a handler on a handler map given a path string
+// Most-specific (longest) pattern wins
+func (mux *ServeMux) match(path string) Handler {
+	var h Handler
+	var n = 0
+	for k, v := range mux.m {
+		if !pathMatch(k, path) {
+			continue
+		}
+		if h == nil || len(k) > n {
+			n = len(k)
+			h = v
+		}
+	}
+	return h
+}
+
+// ServeICAP dispatches the request to the handler whose
+// pattern most closely matches the request URL.
+func (mux *ServeMux) ServeICAP(w ResponseWriter, r *Request) {
+	// Clean path to canonical form and redirect.
+	if p := cleanPath(r.URL.Path); p != r.URL.Path {
+		w.Header().Set("Location", p)
+		w.WriteHeader(http.StatusMovedPermanently, nil, false)
+		return
+	}
+	// Host-specific pattern takes precedence over generic ones
+	h := mux.match(r.URL.Host + r.URL.Path)
+	if h == nil {
+		h = mux.match(r.URL.Path)
+	}
+	if h == nil {
+		h = NotFoundHandler()
+	}
+	h.ServeICAP(w, r)
+}
+
+// Handle registers the handler for the given pattern.
+func (mux *ServeMux) Handle(pattern string, handler Handler) {
+	if pattern == "" {
+		panic("icap: invalid pattern " + pattern)
+	}
+
+	mux.m[pattern] = handler
+
+	// Helpful behavior:
+	// If pattern is /tree/, insert permanent redirect for /tree.
+	n := len(pattern)
+	if n > 0 && pattern[n-1] == '/' {
+		mux.m[pattern[0:n-1]] = RedirectHandler(pattern, http.StatusMovedPermanently)
+	}
+}
+
+// HandleFunc registers the handler function for the given pattern.
+func (mux *ServeMux) HandleFunc(pattern string, handler func(ResponseWriter, *Request)) {
+	mux.Handle(pattern, HandlerFunc(handler))
+}
+
+// Handle registers the handler for the given pattern
+// in the DefaultServeMux.
+// The documentation for ServeMux explains how patterns are matched.
+func Handle(pattern string, handler Handler) { DefaultServeMux.Handle(pattern, handler) }
+
+// HandleFunc registers the handler function for the given pattern
+// in the DefaultServeMux.
+// The documentation for ServeMux explains how patterns are matched.
+func HandleFunc(pattern string, handler func(ResponseWriter, *Request)) {
+	DefaultServeMux.HandleFunc(pattern, handler)
+}
+
+// NotFound replies to the request with an HTTP 404 not found error.
+func NotFound(w ResponseWriter, r *Request) {
+	w.WriteHeader(http.StatusNotFound, nil, false)
+}
+
+// NotFoundHandler returns a simple request handler
+// that replies to each request with a ``404 page not found'' reply.
+func NotFoundHandler() Handler { return HandlerFunc(NotFound) }
+
+// Redirect to a fixed URL
+type redirectHandler struct {
+	url  string
+	code int
+}
+
+func (rh *redirectHandler) ServeICAP(w ResponseWriter, r *Request) {
+	Redirect(w, r, rh.url, rh.code)
+}
+
+// RedirectHandler returns a request handler that redirects
+// each request it receives to the given url using the given
+// status code.
+func RedirectHandler(redirectURL string, code int) Handler {
+	return &redirectHandler{redirectURL, code}
+}
+
+// Redirect replies to the request with a redirect to url,
+// which may be a path relative to the request path.
+func Redirect(w ResponseWriter, r *Request, redirectURL string, code int) {
+	if u, err := url.Parse(redirectURL); err == nil {
+		// If url was relative, make absolute by
+		// combining with request path.
+		// The browser would probably do this for us,
+		// but doing it ourselves is more reliable.
+		oldpath := r.URL.Path
+		if oldpath == "" { // should not happen, but avoid a crash if it does
+			oldpath = "/"
+		}
+		if u.Scheme == "" {
+			// no leading icap://server
+			if redirectURL == "" || redirectURL[0] != '/' {
+				// make relative path absolute
+				olddir, _ := path.Split(oldpath)
+				redirectURL = olddir + redirectURL
+			}
+
+			var query string
+			if i := strings.Index(redirectURL, "?"); i != -1 {
+				redirectURL, query = redirectURL[:i], redirectURL[i:]
+			}
+
+			// clean up but preserve trailing slash
+			trailing := redirectURL[len(redirectURL)-1] == '/'
+			redirectURL = path.Clean(redirectURL)
+			if trailing && redirectURL[len(redirectURL)-1] != '/' {
+				redirectURL += "/"
+			}
+			redirectURL += query
+		}
+	}
+
+	w.Header().Set("Location", redirectURL)
+	w.WriteHeader(code, nil, false)
+}

vendor/github.com/egirna/icap/request.go

@@ -0,0 +1,253 @@
+// Copyright 2011 Andy Balholm. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Reading and parsing of ICAP requests.
+
+// Package icap provides an extensible ICAP server.
+package icap
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/textproto"
+	"net/url"
+	"strconv"
+	"strings"
+)
+
+type badStringError struct {
+	what string
+	str  string
+}
+
+func (e *badStringError) Error() string { return fmt.Sprintf("%s %q", e.what, e.str) }
+
+// A Request represents a parsed ICAP request.
+type Request struct {
+	Method     string               // REQMOD, RESPMOD, OPTIONS, etc.
+	RawURL     string               // The URL given in the request.
+	URL        *url.URL             // Parsed URL.
+	Proto      string               // The protocol version.
+	Header     textproto.MIMEHeader // The ICAP header
+	RemoteAddr string               // the address of the computer sending the request
+	Preview    []byte               // the body data for an ICAP preview
+
+	// The HTTP messages.
+	Request  *http.Request
+	Response *http.Response
+}
+
+// ReadRequest reads and parses a request from b.
+func ReadRequest(b *bufio.ReadWriter) (req *Request, err error) {
+	tp := textproto.NewReader(b.Reader)
+	req = new(Request)
+
+	// Read first line.
+	var s string
+	s, err = tp.ReadLine()
+	if err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		return nil, err
+	}
+
+	f := strings.SplitN(s, " ", 3)
+	if len(f) < 3 {
+		return nil, &badStringError{"malformed ICAP request", s}
+	}
+	req.Method, req.RawURL, req.Proto = f[0], f[1], f[2]
+
+	req.URL, err = url.ParseRequestURI(req.RawURL)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header, err = tp.ReadMIMEHeader()
+	if err != nil {
+		return nil, err
+	}
+
+	s = req.Header.Get("Encapsulated")
+	if s == "" {
+		return req, nil // No HTTP headers or body.
+	}
+	eList := strings.Split(s, ", ")
+	var initialOffset, reqHdrLen, respHdrLen int
+	var hasBody bool
+	var prevKey string
+	var prevValue int
+	for _, item := range eList {
+		eq := strings.Index(item, "=")
+		if eq == -1 {
+			return nil, &badStringError{"malformed Encapsulated: header", s}
+		}
+		key := item[:eq]
+		value, err := strconv.Atoi(item[eq+1:])
+		if err != nil {
+			return nil, &badStringError{"malformed Encapsulated: header", s}
+		}
+
+		// Calculate the length of the previous section.
+		switch prevKey {
+		case "":
+			initialOffset = value
+		case "req-hdr":
+			reqHdrLen = value - prevValue
+		case "res-hdr":
+			respHdrLen = value - prevValue
+		case "req-body", "opt-body", "res-body", "null-body":
+			return nil, fmt.Errorf("%s must be the last section", prevKey)
+		}
+
+		switch key {
+		case "req-hdr", "res-hdr", "null-body":
+		case "req-body", "res-body", "opt-body":
+			hasBody = true
+		default:
+			return nil, &badStringError{"invalid key for Encapsulated: header", key}
+		}
+
+		prevValue = value
+		prevKey = key
+	}
+
+	// Read the HTTP headers.
+	var rawReqHdr, rawRespHdr []byte
+	if initialOffset > 0 {
+		junk := make([]byte, initialOffset)
+		_, err = io.ReadFull(b, junk)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if reqHdrLen > 0 {
+		rawReqHdr = make([]byte, reqHdrLen)
+		_, err = io.ReadFull(b, rawReqHdr)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if respHdrLen > 0 {
+		rawRespHdr = make([]byte, respHdrLen)
+		_, err = io.ReadFull(b, rawRespHdr)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	var bodyReader io.ReadCloser = emptyReader(0)
+	if hasBody {
+		if p := req.Header.Get("Preview"); p != "" {
+			moreBody := true
+			req.Preview, err = ioutil.ReadAll(newChunkedReader(b))
+			if err != nil {
+				if strings.Contains(err.Error(), "ieof") {
+					// The data ended with "0; ieof", which the HTTP chunked reader doesn't understand.
+					moreBody = false
+					err = nil
+				} else {
+					return nil, err
+				}
+			}
+			var r io.Reader = bytes.NewBuffer(req.Preview)
+			if moreBody {
+				r = io.MultiReader(r, &continueReader{buf: b})
+			}
+			bodyReader = ioutil.NopCloser(r)
+		} else {
+			bodyReader = ioutil.NopCloser(newChunkedReader(b))
+		}
+	}
+
+	// Construct the http.Request.
+	if rawReqHdr != nil {
+		invalidURLEscapeFixed := false
+		req.Request, err = http.ReadRequest(bufio.NewReader(bytes.NewBuffer(rawReqHdr)))
+		if err != nil && strings.Contains(err.Error(), "invalid URL escape") {
+			//Fix the request url
+			// Convert the rawReqHdr to string
+			// find the url\path start and end(sould be in the status line
+			// convert the percents into %25
+			// Then reparse the whole request
+			rawReqHdrStr := string(rawReqHdr)
+			result := strings.Split(rawReqHdrStr, "\n")
+			result[0] = strings.Replace(result[0], "%", "%25", -1)
+			// The next is a compromise since when adding "\r\n" it causes the request parsing to fail
+			newReq := strings.Join(result, "\n")
+			req.Request, err = http.ReadRequest(bufio.NewReader(bytes.NewBuffer([]byte(newReq))))
+			if err != nil {
+				return req, fmt.Errorf("error while parsing HTTP request: %v", err)
+			}
+			invalidURLEscapeFixed = true
+		}
+		if err != nil && !invalidURLEscapeFixed {
+			return req, fmt.Errorf("error while parsing HTTP request: %v", err)
+		}
+
+		if req.Method == "REQMOD" {
+			req.Request.Body = bodyReader
+		} else {
+			req.Request.Body = emptyReader(0)
+		}
+	}
+
+	// Construct the http.Response.
+	if rawRespHdr != nil {
+		request := req.Request
+		if request == nil {
+			request, _ = http.NewRequest("GET", "/", nil)
+		}
+		req.Response, err = http.ReadResponse(bufio.NewReader(bytes.NewBuffer(rawRespHdr)), request)
+		if err != nil {
+			return req, fmt.Errorf("error while parsing HTTP response: %v", err)
+		}
+
+		if req.Method == "RESPMOD" {
+			req.Response.Body = bodyReader
+		} else {
+			req.Response.Body = emptyReader(0)
+		}
+	}
+
+	return
+}
+
+// An emptyReader is an io.ReadCloser that always returns os.EOF.
+type emptyReader byte
+
+func (emptyReader) Read(p []byte) (n int, err error) {
+	return 0, io.EOF
+}
+
+func (emptyReader) Close() error {
+	return nil
+}
+
+// A continueReader sends a "100 Continue" message the first time Read
+// is called, creates a ChunkedReader, and reads from that.
+type continueReader struct {
+	buf *bufio.ReadWriter // the underlying connection
+	cr  io.Reader         // the ChunkedReader
+}
+
+func (c *continueReader) Read(p []byte) (n int, err error) {
+	if c.cr == nil {
+		_, err := c.buf.WriteString("ICAP/1.0 100 Continue\r\n\r\n")
+		if err != nil {
+			return 0, err
+		}
+		err = c.buf.Flush()
+		if err != nil {
+			return 0, err
+		}
+		c.cr = newChunkedReader(c.buf)
+	}
+
+	return c.cr.Read(p)
+}

vendor/github.com/egirna/icap/response.go

@@ -0,0 +1,229 @@
+// Copyright 2011 Andy Balholm. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Responding to ICAP requests.
+
+package icap
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"net/http/httputil"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// ResponseWriter ---
+type ResponseWriter interface {
+	// Header returns the header map that will be sent by WriteHeader.
+	// Changing the header after a call to WriteHeader (or Write) has
+	// no effect.
+	Header() http.Header
+
+	// Write writes the data to the connection as part of an ICAP reply.
+	// If WriteHeader has not yet been called, Write calls WriteHeader(http.StatusOK, nil)
+	// before writing the data.
+	Write([]byte) (int, error)
+
+	// Write raw data to the connection.
+	WriteRaw(string)
+
+	// WriteHeader sends an ICAP response header with status code.
+	// Then it sends an HTTP header if httpMessage is not nil.
+	// httpMessage may be an *http.Request or an *http.Response.
+	// hasBody should be true if there will be calls to Write(), generating a message body.
+	WriteHeader(code int, httpMessage interface{}, hasBody bool)
+}
+
+type respWriter struct {
+	conn        *conn          // information on the connection
+	req         *Request       // the request that is being responded to
+	header      http.Header    // the ICAP header to write for the response
+	wroteHeader bool           // true if the headers have already been written
+	wroteRaw    bool           // true if raw data was written to the connection
+	cw          io.WriteCloser // the chunked writer used to write the body
+}
+
+func (w *respWriter) Header() http.Header {
+	return w.header
+}
+
+func (w *respWriter) Write(p []byte) (n int, err error) {
+	if !w.wroteHeader {
+		w.WriteHeader(http.StatusOK, nil, true)
+	}
+
+	if w.cw == nil {
+		return 0, errors.New("called Write() on an icap.ResponseWriter that should not have a body")
+	}
+	return w.cw.Write(p)
+}
+
+func (w *respWriter) WriteRaw(p string) {
+	bw := w.conn.buf.Writer
+	io.WriteString(bw, p)
+	w.wroteRaw = true
+}
+
+func (w *respWriter) WriteHeader(code int, httpMessage interface{}, hasBody bool) {
+	if w.wroteHeader {
+		log.Println("Called WriteHeader twice on the same connection")
+		return
+	}
+
+	// Make the HTTP header and the Encapsulated: header.
+	var header []byte
+	var encap string
+	var err error
+
+	switch msg := httpMessage.(type) {
+	case *http.Request:
+		header, err = httpRequestHeader(msg)
+		if err != nil {
+			break
+		}
+		if hasBody {
+			encap = fmt.Sprintf("req-hdr=0, req-body=%d", len(header))
+		} else {
+			encap = fmt.Sprintf("req-hdr=0, null-body=%d", len(header))
+		}
+
+	case *http.Response:
+		header, err = httpResponseHeader(msg)
+		if err != nil {
+			break
+		}
+		if hasBody {
+			encap = fmt.Sprintf("res-hdr=0, res-body=%d", len(header))
+		} else {
+			encap = fmt.Sprintf("res-hdr=0, null-body=%d", len(header))
+		}
+	}
+
+	if encap == "" {
+		if hasBody {
+			method := w.req.Method
+			if len(method) > 3 {
+				method = method[0:3]
+			}
+			method = strings.ToLower(method)
+			encap = fmt.Sprintf("%s-body=0", method)
+		} else {
+			encap = "null-body=0"
+		}
+	}
+
+	w.header.Set("Encapsulated", encap)
+	if _, ok := w.header["Date"]; !ok {
+		w.Header().Set("Date", time.Now().UTC().Format(http.TimeFormat))
+	}
+
+	w.header.Set("Connection", "close")
+
+	bw := w.conn.buf.Writer
+	status := StatusText(code)
+	if status == "" {
+		status = fmt.Sprintf("status code %d", code)
+	}
+	fmt.Fprintf(bw, "ICAP/1.0 %d %s\r\n", code, status)
+	w.header.Write(bw)
+	io.WriteString(bw, "\r\n")
+
+	if header != nil {
+		bw.Write(header)
+	}
+
+	w.wroteHeader = true
+
+	if hasBody {
+		w.cw = httputil.NewChunkedWriter(w.conn.buf.Writer)
+	}
+}
+
+func (w *respWriter) finishRequest() {
+	if !w.wroteHeader {
+		w.WriteHeader(http.StatusOK, nil, false)
+	}
+
+	if w.cw != nil && !w.wroteRaw {
+		w.cw.Close()
+		w.cw = nil
+		io.WriteString(w.conn.buf, "\r\n")
+	}
+
+	w.conn.buf.Flush()
+}
+
+// httpRequestHeader returns the headers for an HTTP request
+// as a slice of bytes in a form suitable for including in an ICAP message.
+func httpRequestHeader(req *http.Request) (hdr []byte, err error) {
+	buf := new(bytes.Buffer)
+
+	if req.URL == nil {
+		if err != nil {
+			return nil, errors.New("icap: httpRequestHeader called on Request with no URL")
+		}
+	}
+
+	host := req.URL.Host
+	if host == "" {
+		host = req.Host
+	}
+	req.Header.Set("Host", host)
+
+	uri := req.URL.String()
+
+	fmt.Fprintf(buf, "%s %s %s\r\n", valueOrDefault(req.Method, "GET"), uri, valueOrDefault(req.Proto, "HTTP/1.1"))
+	req.Header.WriteSubset(buf, map[string]bool{
+		"Transfer-Encoding": true,
+		"Content-Length":    true,
+	})
+	io.WriteString(buf, "\r\n")
+
+	return buf.Bytes(), nil
+}
+
+// httpResponseHeader returns the headers for an HTTP response
+// as a slice of bytes.
+func httpResponseHeader(resp *http.Response) (hdr []byte, err error) {
+	buf := new(bytes.Buffer)
+
+	// Status line
+	text := resp.Status
+	if text == "" {
+		text = http.StatusText(resp.StatusCode)
+		if text == "" {
+			text = "status code " + strconv.Itoa(resp.StatusCode)
+		}
+	}
+	proto := resp.Proto
+	if proto == "" {
+		proto = "HTTP/1.1"
+	}
+	fmt.Fprintf(buf, "%s %d %s\r\n", proto, resp.StatusCode, text)
+	if _, xIcap206Exists := resp.Header["X-Icap-206"]; xIcap206Exists {
+		resp.Header.Write(buf)
+	} else {
+		resp.Header.WriteSubset(buf, map[string]bool{
+			"Transfer-Encoding": true,
+			"Content-Length":    false,
+		})
+	}
+	io.WriteString(buf, "\r\n")
+
+	return buf.Bytes(), nil
+}
+
+// Return value if nonempty, def otherwise.
+func valueOrDefault(value, def string) string {
+	if value != "" {
+		return value
+	}
+	return def
+}

vendor/github.com/egirna/icap/server.go

@@ -0,0 +1,244 @@
+// Copyright 2011 Andy Balholm. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Network connections and request dispatch for the ICAP server.
+
+package icap
+
+import (
+	"bufio"
+	"bytes"
+	"crypto/tls"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"net/textproto"
+	"net/url"
+	"runtime/debug"
+	"time"
+)
+
+// Handler Objects implementing the Handler interface can be registered
+// to serve ICAP requests.
+//
+// ServeICAP should write reply headers and data to the ResponseWriter
+// and then return.
+type Handler interface {
+	ServeICAP(ResponseWriter, *Request)
+}
+
+// The HandlerFunc type is an adapter to allow the use of
+// ordinary functions as ICAP handlers.  If f is a function
+// with the appropriate signature, HandlerFunc(f) is a
+// Handler object that calls f.
+type HandlerFunc func(ResponseWriter, *Request)
+
+// ServeICAP calls f(w, r).
+func (f HandlerFunc) ServeICAP(w ResponseWriter, r *Request) {
+	f(w, r)
+}
+
+// A conn represents the server side of an ICAP connection.
+type conn struct {
+	remoteAddr string            // network address of remote side
+	handler    Handler           // request handler
+	rwc        net.Conn          // i/o connection
+	buf        *bufio.ReadWriter // buffered rwc
+}
+
+// Create new connection from rwc.
+func newConn(rwc net.Conn, handler Handler) (c *conn, err error) {
+	c = new(conn)
+	c.remoteAddr = rwc.RemoteAddr().String()
+	c.handler = handler
+	c.rwc = rwc
+	br := bufio.NewReader(rwc)
+	bw := bufio.NewWriter(rwc)
+	c.buf = bufio.NewReadWriter(br, bw)
+
+	return c, nil
+}
+
+// Read next request from connection.
+func (c *conn) readRequest() (w *respWriter, err error) {
+	var req *Request
+	if req, err = ReadRequest(c.buf); err != nil {
+		//return req, err
+
+	}
+	if req == nil {
+		req = new(Request)
+	} else {
+		req.RemoteAddr = c.remoteAddr
+	}
+
+	w = new(respWriter)
+	w.conn = c
+	w.req = req
+	w.header = make(http.Header)
+	return w, err
+}
+
+// Close the connection.
+func (c *conn) close() {
+	if c.buf != nil {
+		c.buf.Flush()
+		c.buf = nil
+	}
+	if c.rwc != nil {
+		c.rwc.Close()
+		c.rwc = nil
+	}
+}
+
+// Serve a new connection.
+func (c *conn) serve(debugLevel int) {
+	defer func() {
+		err := recover()
+		if err == nil {
+			return
+		}
+		c.rwc.Close()
+
+		var buf bytes.Buffer
+		fmt.Fprintf(&buf, "icap: panic serving %v: %v\n", c.remoteAddr, err)
+		buf.Write(debug.Stack())
+		log.Print(buf.String())
+	}()
+	var w *respWriter
+	w, err := c.readRequest()
+	// In a case of parsing error there should be an option to handle a dummy request to not fail the whole service.
+
+	if err != nil {
+		if debugLevel > 0 {
+			log.Println("error while reading request:", err)
+			log.Println("error while reading request:", w)
+			log.Println("error while reading request:", w.conn)
+			log.Println("error while reading request:", w.req)
+			log.Println("error while reading request:", w.header)
+		}
+		//		c.rwc.Close()
+		//		return
+		if w == nil {
+			w = new(respWriter)
+		}
+		w.conn = c
+		w.req = new(Request)
+		w.req.Method = "ERRDUMMY"
+		w.req.RawURL = "/"
+		w.req.Proto = "ICAP/1.0"
+		w.req.URL, _ = url.ParseRequestURI("icap://localhost/")
+		w.req.Header = textproto.MIMEHeader{
+			"Connection": {"close"},
+			// "Error:":     {err.Error()},
+		}
+	}
+
+	c.handler.ServeICAP(w, w.req)
+	w.finishRequest()
+
+	c.close()
+}
+
+// A Server defines parameters for running an ICAP server.
+type Server struct {
+	Addr         string  // TCP address to listen on, ":1344" if empty
+	Handler      Handler // handler to invoke
+	ReadTimeout  time.Duration
+	WriteTimeout time.Duration
+	DebugLevel   int
+}
+
+// ListenAndServe listens on the TCP network address srv.Addr and then
+// calls Serve to handle requests on incoming connections.  If
+// srv.Addr is blank, ":1344" is used.
+func (srv *Server) ListenAndServe() error {
+	addr := srv.Addr
+	if addr == "" {
+		addr = ":1344"
+	}
+	l, err := net.Listen("tcp", addr)
+	if err != nil {
+		return err
+	}
+	return srv.Serve(l)
+}
+
+// ListenAndServeTLS ---
+func (srv *Server) ListenAndServeTLS(cert, key string) error {
+
+	cer, err := tls.LoadX509KeyPair(cert, key)
+	if err != nil {
+		return err
+	}
+	addr := srv.Addr
+	if addr == "" {
+		addr = ":1344"
+	}
+
+	config := &tls.Config{Certificates: []tls.Certificate{cer}}
+	l, err := tls.Listen("tcp", addr, config)
+	if err != nil {
+		return err
+	}
+	return srv.Serve(l)
+}
+
+// Serve accepts incoming connections on the Listener l, creating a
+// new service thread for each.  The service threads read requests and
+// then call srv.Handler to reply to them.
+func (srv *Server) Serve(l net.Listener) error {
+	defer l.Close()
+	handler := srv.Handler
+	if handler == nil {
+		handler = DefaultServeMux
+	}
+
+	for {
+		rw, err := l.Accept()
+		if err != nil {
+			if ne, ok := err.(net.Error); ok && ne.Temporary() {
+				log.Printf("icap: Accept error: %v", err)
+				continue
+			}
+			return err
+		}
+		if srv.ReadTimeout != 0 {
+			rw.SetReadDeadline(time.Now().Add(srv.ReadTimeout))
+		}
+		if srv.WriteTimeout != 0 {
+			rw.SetWriteDeadline(time.Now().Add(srv.WriteTimeout))
+		}
+		c, err := newConn(rw, handler)
+		if err != nil {
+			continue
+		}
+		go c.serve(srv.DebugLevel)
+	}
+	// The next line is only there to see one specific edge case whichc should never happen.
+	panic("Shuold never be reached")
+}
+
+// Serve accepts incoming ICAP connections on the listener l,
+// creating a new service thread for each.  The service threads
+// read requests and then call handler to reply to them.
+func Serve(l net.Listener, handler Handler) error {
+	srv := &Server{Handler: handler}
+	return srv.Serve(l)
+}
+
+// ListenAndServe listens on the TCP network address addr
+// and then calls Serve with handler to handle requests
+// on incoming connections.
+func ListenAndServe(addr string, handler Handler) error {
+	server := &Server{Addr: addr, Handler: handler}
+	return server.ListenAndServe()
+}
+
+// ListenAndServeTLS --
+func ListenAndServeTLS(addr, cert, key string, handler Handler) error {
+	server := &Server{Addr: addr, Handler: handler}
+	return server.ListenAndServeTLS(cert, key)
+}

vendor/github.com/egirna/icap/status.go

@@ -0,0 +1,34 @@
+// Copyright 2011 Andy Balholm. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// ICAP status codes.
+
+package icap
+
+import (
+	"net/http"
+)
+
+var statusText = map[int]string{
+	100: "Continue",
+	204: "No Modifications",
+	400: "Bad Request",
+	404: "ICAP Service Not Found",
+	405: "Method Not Allowed",
+	408: "Request Timeout",
+	500: "Server Error",
+	501: "Method Not Implemented",
+	502: "Bad Gateway",
+	503: "Service Overloaded",
+	505: "ICAP Version Not Supported",
+}
+
+// StatusText returns a text for the ICAP status code. It returns the empty string if the code is unknown.
+func StatusText(code int) string {
+	text, ok := statusText[code]
+	if ok {
+		return text
+	}
+	return http.StatusText(code)
+}