Stackedit/js/gdrive.js
2013-04-04 20:19:29 +01:00

426 lines
12 KiB
JavaScript

define(["jquery", "core", "async-runner"], function($, core, asyncTaskRunner) {
// Dependencies
var fileManager = undefined;
var connected = false;
var authenticated = false;
var gdrive = {};
// Try to connect Gdrive by downloading client.js
function connect(callback) {
callback = callback || core.doNothing;
var asyncTask = {};
asyncTask.run = function() {
if (connected === true) {
asyncTask.success();
return;
}
delayedFunction = function() {
asyncTask.success();
};
$.ajax({
url : "https://apis.google.com/js/client.js?onload=runDelayedFunction",
dataType : "script", timeout : AJAX_TIMEOUT
}).fail(function() {
asyncTask.error();
});
};
asyncTask.onSuccess = function() {
delayedFunction = undefined;
connected = true;
callback();
};
asyncTask.onError = function() {
delayedFunction = undefined;
core.setOffline();
callback();
};
asyncTaskRunner.addTask(asyncTask);
}
// Try to authenticate with Oauth
function authenticate(callback, immediate) {
callback = callback || core.doNothing;
if (immediate === undefined) {
immediate = true;
}
connect(function() {
if (connected === false) {
callback();
return;
}
var asyncTask = {};
// If not immediate we add time for user to enter his credentials
if (immediate === false) {
asyncTask.timeout = AUTH_POPUP_TIMEOUT;
}
asyncTask.run = function() {
if (authenticated === true) {
asyncTask.success();
return;
}
if (immediate === false) {
core.showMessage("Please make sure the Google authorization popup is not blocked by your browser.");
}
gapi.auth.authorize({ 'client_id' : GOOGLE_CLIENT_ID,
'scope' : GOOGLE_SCOPES, 'immediate' : immediate }, function(
authResult) {
if (!authResult || authResult.error) {
asyncTask.error();
return;
}
gapi.client.load('drive', 'v2', function() {
authenticated = true;
asyncTask.success();
});
});
};
asyncTask.onSuccess = function() {
callback();
};
asyncTask.onError = function() {
// If immediate did not work retry without immediate flag
if (connected === true && immediate === true) {
authenticate(callback, false);
return;
}
callback();
};
asyncTaskRunner.addTask(asyncTask);
});
}
function upload(fileId, parentId, title, content, callback) {
callback = callback || core.doNothing;
authenticate(function() {
if (connected === false) {
callback();
return;
}
var fileSyncIndex = undefined;
var asyncTask = {};
asyncTask.run = function() {
var boundary = '-------314159265358979323846';
var delimiter = "\r\n--" + boundary + "\r\n";
var close_delim = "\r\n--" + boundary + "--";
var contentType = 'text/x-markdown';
var metadata = { title : title, mimeType : contentType };
if (parentId !== undefined) {
// Specify the directory
metadata.parents = [ { kind : 'drive#fileLink',
id : parentId } ];
}
var path = '/upload/drive/v2/files';
var method = 'POST';
if (fileId !== undefined) {
// If it's an update
path += "/" + fileId;
method = 'PUT';
}
var base64Data = core.encodeBase64(content);
var multipartRequestBody = delimiter
+ 'Content-Type: application/json\r\n\r\n'
+ JSON.stringify(metadata) + delimiter + 'Content-Type: '
+ contentType + '\r\n'
+ 'Content-Transfer-Encoding: base64\r\n' + '\r\n'
+ base64Data + close_delim;
var request = gapi.client
.request({
'path' : path,
'method' : method,
'params' : { 'uploadType' : 'multipart', },
'headers' : { 'Content-Type' : 'multipart/mixed; boundary="'
+ boundary + '"', }, 'body' : multipartRequestBody, });
request.execute(function(response) {
if (response && response.id) {
// Upload success
fileSyncIndex = SYNC_PROVIDER_GDRIVE + response.id;
localStorage[fileSyncIndex + ".etag"] = response.etag;
asyncTask.success();
return;
}
var error = response.error;
// If it's an update and file has been removed from Google Drive
if(error !== undefined && fileId !== undefined && error.code === 404) {
core.showMessage('"' + title + '" has been removed from Google Drive.');
fileManager.removeSync(SYNC_PROVIDER_GDRIVE + fileId);
fileManager.updateFileTitles();
// We assume it's not error
fileSyncIndex = null;
asyncTask.success();
return;
}
// Handle error
handleError(error, asyncTask, callback);
});
};
asyncTask.onSuccess = function() {
callback(fileSyncIndex);
};
asyncTaskRunner.addTask(asyncTask);
});
}
gdrive.checkUpdates = function(lastChangeId, callback) {
callback = callback || core.doNothing;
authenticate(function() {
if (connected === false) {
callback();
return;
}
var changes = [];
var newChangeId = lastChangeId || 0;
function retrievePageOfChanges(request) {
var nextPageToken = undefined;
var asyncTask = {};
asyncTask.run = function() {
request.execute(function(response) {
if (response && response.largestChangeId) {
// Retrieve success
newChangeId = response.largestChangeId;
nextPageToken = response.nextPageToken;
if (response.items !== undefined) {
for ( var i = 0; i < response.items.length; i++) {
var item = response.items[i];
var etag = localStorage[SYNC_PROVIDER_GDRIVE
+ item.fileId + ".etag"];
if (etag
&& (item.deleted === true || item.file.etag != etag)) {
changes.push(item);
}
}
}
asyncTask.success();
return;
}
// Handle error
handleError(response.error, asyncTask, callback);
});
};
asyncTask.onSuccess = function() {
if (nextPageToken !== undefined) {
request = gapi.client.drive.changes
.list({ 'pageToken' : nextPageToken });
retrievePageOfChanges(request);
} else {
callback(changes, newChangeId);
}
};
asyncTaskRunner.addTask(asyncTask);
}
var initialRequest = gapi.client.drive.changes
.list({ 'startChangeId' : newChangeId + 1 });
retrievePageOfChanges(initialRequest);
});
};
gdrive.downloadMetadata = function(ids, callback, result) {
callback = callback || core.doNothing;
result = result || [];
if(ids.length === 0) {
callback(result);
return;
}
authenticate(function() {
if (connected === false) {
callback();
return;
}
var id = ids.pop();
var asyncTask = {};
asyncTask.run = function() {
var accessToken = gapi.auth.getToken().access_token;
$.ajax({
url : "https://www.googleapis.com/drive/v2/files/" + id,
headers : { "Authorization" : "Bearer " + accessToken },
dataType : "json",
timeout : AJAX_TIMEOUT
}).done(function(data, textStatus, jqXHR) {
result.push(data);
asyncTask.success();
}).fail(function(jqXHR) {
var error = {
code: jqXHR.status,
message: jqXHR.statusText
};
// Handle error
if(error.code === 404) {
error = "File is not available.";
}
handleError(error, asyncTask, callback);
});
};
asyncTask.onSuccess = function() {
gdrive.downloadMetadata(ids, callback, result);
};
asyncTaskRunner.addTask(asyncTask);
});
};
gdrive.downloadContent = function(objects, callback, result) {
callback = callback || core.doNothing;
result = result || [];
if(objects.length === 0) {
callback(result);
return;
}
var object = objects.pop();
result.push(object);
var file = undefined;
// object may be a file
if(object.kind == "drive#file") {
file = object;
}
// object may be a change
else if(object.kind == "drive#change") {
file = object.file;
}
if(file === undefined) {
this.downloadContent(objects, callback, result);
return;
}
authenticate(function() {
if (connected === false) {
callback();
return;
}
var asyncTask = {};
asyncTask.run = function() {
var accessToken = gapi.auth.getToken().access_token;
$.ajax({
url : file.downloadUrl,
headers : { "Authorization" : "Bearer " + accessToken },
dataType : "text",
timeout : AJAX_TIMEOUT
}).done(function(data, textStatus, jqXHR) {
file.content = data;
asyncTask.success();
}).fail(function(jqXHR) {
var error = {
code: jqXHR.status,
message: jqXHR.statusText
};
// Handle error
handleError(error, asyncTask, callback);
});
};
asyncTask.onSuccess = function() {
gdrive.downloadContent(objects, callback, result);
};
asyncTaskRunner.addTask(asyncTask);
});
};
function handleError(error, asyncTask, callback) {
var errorMsg = undefined;
asyncTask.onError = function() {
if (errorMsg !== undefined) {
core.showError(errorMsg);
}
callback();
};
if (error) {
// Try to analyze the error
if (typeof error === "string") {
errorMsg = error;
}
else if (error.code >= 500 && error.code < 600) {
errorMsg = "Google Drive is not accessible.";
// Retry as described in Google's best practices
asyncTask.retry();
return;
} else if (error.code === 401 || error.code === 403) {
authenticated = false;
errorMsg = "Access to Google Drive is not authorized.";
} else if (error.code <= 0) {
connected = false;
authenticated = false;
core.setOffline();
} else {
errorMsg = "Google Drive error (" + error.code + ": "
+ error.message + ").";
}
}
asyncTask.error();
}
gdrive.createFile = function(title, content, callback) {
upload(undefined, undefined, title, content, callback);
};
gdrive.updateFile = function(id, title, content, callback) {
upload(id, undefined, title, content, callback);
};
gdrive.importFiles = function(ids) {
gdrive.downloadMetadata(ids, function(result) {
if(result === undefined) {
return;
}
gdrive.downloadContent(result, function(result) {
if(result === undefined) {
return;
}
for(var i=0; i<result.length; i++) {
var file = result[i];
fileSyncIndex = SYNC_PROVIDER_GDRIVE + file.id;
localStorage[fileSyncIndex + ".etag"] = file.etag;
var fileIndex = fileManager.createFile(file.title, file.content, [fileSyncIndex]);
fileManager.selectFile(fileIndex);
core.showMessage('"' + file.title + '" imported successfully from Google Drive.');
}
});
});
};
gdrive.init = function(fileManagerModule) {
fileManager = fileManagerModule;
var state = localStorage["sync.gdrive.state"];
if(state === undefined) {
return;
}
localStorage.removeItem("sync.gdrive.state");
state = JSON.parse(state);
if (state.action == "create") {
upload(undefined, state.folderId, GDRIVE_DEFAULT_FILE_TITLE,
"", function(fileSyncIndex) {
if(fileSyncIndex === undefined) {
return;
}
var fileIndex = fileManager.createFile(GDRIVE_DEFAULT_FILE_TITLE, "", [fileSyncIndex]);
fileManager.selectFile(fileIndex);
core.showMessage('"' + GDRIVE_DEFAULT_FILE_TITLE + '" created successfully on Google Drive.');
});
}
else if (state.action == "open") {
var ids = [];
for(var i=0; i<state.ids.length; i++) {
var id = state.ids[i];
var fileSyncIndex = SYNC_PROVIDER_GDRIVE + id;
var fileIndex = fileManager.getFileIndexFromSync(fileSyncIndex);
if(fileIndex !== undefined) {
fileManager.selectFile(fileIndex);
} else {
ids.push(id);
}
}
gdrive.importFiles(ids);
}
};
return gdrive;
});