/
rest.go
231 lines (163 loc) · 5.01 KB
/
rest.go
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package main
import (
"bytes"
"encoding/json"
"io/ioutil"
"net/http"
"time"
"github.com/couchbaselabs/logg"
)
//AuthResponse response from auth service
type AuthResponse struct {
SessionID string `json:"session_id"`
Expires string `json:"expires"`
CookieName string `json:"cookie_name"`
}
var globalHTTP = &http.Client{}
func readResource(url string) ([]byte, error) {
logg.LogTo(TagLog, "Getting %s\n", url)
res, err := http.Get(url)
if err != nil {
return nil, err
}
document, err := ioutil.ReadAll(res.Body)
res.Body.Close()
return document, err
}
// getDocument queries a document via sync gateway's REST API
// and returns the document contents and last revision
func getDocument(documentID string) ([]byte, string, error) {
result, rev, err := getRawDocument(documentID)
if err != nil {
return result, rev, err
}
//cleanup the remote document
result, err = cleanupSyncDocument(result)
return result, rev, err
}
func getRawDocument(documentID string) ([]byte, string, error) {
var syncEndpoint = getSyncEndpoint() + documentID
result, err := readResource(syncEndpoint)
var jsonObject map[string]interface{}
err = json.Unmarshal(result, &jsonObject)
if err != nil {
return nil, "", err
}
rev, _ := jsonObject["_rev"].(string)
return result, rev, nil
}
func postDocument(document []byte, documentID string) (string, error) {
var syncEndpoint = getSyncEndpoint() + documentID
_, rev, err := getDocument(documentID)
if rev != "" {
syncEndpoint += "?rev=" + rev
}
request, err := http.NewRequest("PUT", syncEndpoint, bytes.NewReader(document))
request.ContentLength = int64(len(document))
setAuth(request)
logRequest(request)
response, err := globalHTTP.Do(request)
if err != nil {
return "", err
}
defer response.Body.Close()
contents, err := ioutil.ReadAll(response.Body)
if err != nil {
return "", err
}
logg.LogTo(TagLog, "%s", contents)
var jsonObject map[string]interface{}
err = json.Unmarshal(contents, &jsonObject)
if err != nil {
return "", err
}
rev, ok := jsonObject["rev"].(string)
if ok {
return rev, err
}
return "", nil
}
func deleteDocument(documentID string) error {
var syncEndpoint = getSyncEndpoint() + documentID
_, rev, err := getDocument(documentID)
if rev != "" {
syncEndpoint += "?rev=" + rev
}
request, err := http.NewRequest("DELETE", syncEndpoint, nil)
setAuth(request)
logRequest(request)
response, err := globalHTTP.Do(request)
if err != nil {
return err
}
defer response.Body.Close()
return err
}
func postAttachment(fileContents []byte, parentDoc string, documentName string) error {
var syncEndpoint = getSyncEndpoint() + parentDoc + "/" + documentName
request, err := http.NewRequest("PUT", syncEndpoint, bytes.NewReader(fileContents))
request.Header.Add("Content-Type", http.DetectContentType(fileContents))
setAuth(request)
logg.LogTo(TagLog, "%s", syncEndpoint)
response, err := globalHTTP.Do(request)
defer response.Body.Close()
logg.LogTo(TagLog, "Post status code: %v", response.StatusCode)
return err
}
func setAuth(request *http.Request) {
if authConfig.Username != "" && authConfig.Password != "" {
if authConfig.SimpleAuth {
request.SetBasicAuth(authConfig.Username, authConfig.Password)
} else {
session := authenticate()
layout := "2006-01-02T15:04:05Z07:00"
expire, err := time.Parse(layout, session.Expires)
if err != nil {
logg.LogPanic("Error parsing time: %v", err)
}
rawCookie := []string{session.CookieName + "=" + session.SessionID}
maxAge := 0
secure := true
httpOnly := true
path := "/"
cookie := http.Cookie{session.CookieName, session.SessionID, path, config.SyncURL, expire, expire.Format(time.UnixDate), maxAge, secure, httpOnly, rawCookie[0], rawCookie}
request.AddCookie(&cookie)
}
}
}
//authenticate uses a custom service to authenticate against a credentials repository like Active Directory
//and returns a session from sync gateway
func authenticate() AuthResponse {
request, err := http.NewRequest("POST", authConfig.ServerURL, bytes.NewReader([]byte("{\"username\": \""+authConfig.Username+"\", \"password\": \""+authConfig.Password+"\"}")))
if err != nil {
logg.LogPanic("Error creating request: %v", err)
}
logRequest(request)
response, err := globalHTTP.Do(request)
if err != nil {
logg.LogPanic("Error authenticating: %v", err)
}
defer response.Body.Close()
authResponse := AuthResponse{}
document, err := ioutil.ReadAll(response.Body)
if err != nil {
logg.LogPanic("Error reading contents: %v", err)
}
json.Unmarshal(document, &authResponse)
return authResponse
}
func getAttachmentDigest(documentID, attachment string) (string, error) {
doc, _, err := getRawDocument(documentID)
if err != nil {
return "", err
}
var jsonObject map[string]interface{}
err = json.Unmarshal(doc, &jsonObject)
if err != nil {
return "", err
}
att, _ := jsonObject["_attachments"].(map[string]interface{})
attContent, _ := att[attachment].(map[string]interface{})
result, _ := attContent["digest"].(string)
return result, err
}