mirror of https://github.com/perkeep/perkeep.git
135 lines
4.0 KiB
Go
135 lines
4.0 KiB
Go
/*
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Copyright 2013 The Camlistore Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package flickr
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import (
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"encoding/json"
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"log"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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"strings"
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"camlistore.org/pkg/httputil"
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"camlistore.org/pkg/osutil"
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"camlistore.org/third_party/github.com/garyburd/go-oauth/oauth"
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)
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var (
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oauthClient = &oauth.Client{
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TemporaryCredentialRequestURI: "http://www.flickr.com/services/oauth/request_token",
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ResourceOwnerAuthorizationURI: "http://www.flickr.com/services/oauth/authorize",
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TokenRequestURI: "http://www.flickr.com/services/oauth/access_token",
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}
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userFile = filepath.Join(osutil.CamliConfigDir(), "flickr-credentials.json")
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)
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// userInfo represents the Flickr user whose account we are interacting with.
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// This struct is also serialized to <config-dir>/flickr-credentials.json.
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// TODO(aa): Store this state within camlistore itself!
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// TODO(aa): Support multiple instances of the importer per camlistore user.
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type userInfo struct {
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Id string `json:"id"`
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Cred *oauth.Credentials `json:"creds"`
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}
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func writeCredentials(user *userInfo) {
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fi, err := os.Create(userFile)
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if err != nil {
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log.Printf("Error creating flickr credentials file: %s", err)
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return
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}
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if err = json.NewEncoder(fi).Encode(user); err != nil {
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log.Printf("Error writing flickr credentials: %s", err)
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}
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}
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// This returns nil,nil if the file doesn't exist. Any other error bad.
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func readCredentials() (*userInfo, error) {
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fi, err := os.Open(userFile)
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if os.IsNotExist(err) {
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return nil, nil
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}
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if err != nil {
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return nil, err
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}
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defer fi.Close()
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user := &userInfo{}
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err = json.NewDecoder(fi).Decode(user)
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if err != nil {
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return nil, err
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}
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return user, nil
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}
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func (im *imp) serveLogin(w http.ResponseWriter, r *http.Request) {
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if oauthClient.Credentials.Token == "" || oauthClient.Credentials.Secret == "" {
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w.Write([]byte("<h1>Bonk</h1>"))
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w.Write([]byte("<p>You need a Flickr API key to ride this attraction."))
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w.Write([]byte("<p><a href='http://www.flickr.com/services/apps/create/noncommercial/'>Get yours here</a> then modify the 'importer-flickr' key in your server-config.json file and restart your server."))
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return
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}
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callback := im.host.BaseURL + "callback"
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tempCred, err := oauthClient.RequestTemporaryCredentials(im.host.HTTPClient(), callback, nil)
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if err != nil {
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httputil.ForbiddenError(w, "Error getting temp cred: %s", err)
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return
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}
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writeCredentials(&userInfo{Cred: tempCred})
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authURL := oauthClient.AuthorizationURL(tempCred, url.Values{"perms": {"read"}})
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http.Redirect(w, r, authURL, 302)
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}
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func (im *imp) serveCallback(w http.ResponseWriter, r *http.Request) {
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tempUser, err := readCredentials()
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if err != nil {
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httputil.BadRequestError(w, err.Error())
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return
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}
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if tempUser.Cred.Token != r.FormValue("oauth_token") {
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httputil.ForbiddenError(w, "Unknown oauth_token.")
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return
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}
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tokenCred, form, err := oauthClient.RequestToken(im.host.HTTPClient(),
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tempUser.Cred, r.FormValue("oauth_verifier"))
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if err != nil {
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httputil.ForbiddenError(w, "Error getting request token: %s ", err)
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return
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}
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im.user = &userInfo{
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Id: form.Get("user_nsid"),
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Cred: tokenCred,
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}
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writeCredentials(im.user)
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http.Redirect(w, r, im.host.BaseURL+"?mode=start", 302)
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}
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func (im *imp) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if strings.HasSuffix(r.URL.Path, "/login") {
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im.serveLogin(w, r)
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} else if strings.HasSuffix(r.URL.Path, "/callback") {
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im.serveCallback(w, r)
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} else {
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httputil.BadRequestError(w, "Unknown path: %s", r.URL.Path)
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}
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}
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