Mercurial > snowl
annotate extension/modules/feed.js @ 108:ec5e374be495
show favicons in the subscriptions sidebar
| author | Myk Melez <myk@mozilla.org> |
|---|---|
| date | Mon, 19 May 2008 00:01:05 -0700 |
| parents | 2a08b4a82802 |
| children | 754441ddeaa3 |
| rev | line source |
|---|---|
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1cbd4c5a511b
link the source name to the human URI if available; add a new SnowlFeedSubscriber object that can handle subscribing to feeds from various interfaces and which sets the human URI if available; make the OPML importer use the new SnowlFeedSubscriber object
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1 EXPORTED_SYMBOLS = ["SnowlFeed", "SnowlFeedSubscriber"]; |
| 14 | 2 |
| 3 const Cc = Components.classes; | |
| 4 const Ci = Components.interfaces; | |
| 5 const Cr = Components.results; | |
| 6 const Cu = Components.utils; | |
| 7 | |
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8 // FIXME: factor this out into a common file. |
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9 const PART_TYPE_CONTENT = 1; |
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10 const PART_TYPE_SUMMARY = 2; |
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11 |
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register the resource alias to the top-level directory rather than the modules directory for consistency with resource://gre/modules/ URLs and so we can use it to load resources from elsewhere in the extension later; this means converting chrome://snowl/module.js URLs into chrome://snowl/modules/module.js URLs
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12 Cu.import("resource://snowl/modules/log4moz.js"); |
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13 Cu.import("resource://snowl/modules/datastore.js"); |
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14 Cu.import("resource://snowl/modules/URI.js"); |
| 14 | 15 |
| 16 var SnowlFeedClient = { | |
| 17 // XXX Make this take a feed ID once it stores the list of subscribed feeds | |
| 18 // in the datastore. | |
| 19 refresh: function(aFeedURL) { | |
| 20 let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(); | |
| 21 | |
| 22 request.QueryInterface(Ci.nsIDOMEventTarget); | |
| 23 let t = this; | |
| 24 request.addEventListener("load", function(aEvent) { t.onLoad(aEvent) }, false); | |
| 25 request.addEventListener("error", function(aEvent) { t.onError(aEvent) }, false); | |
| 26 | |
| 27 request.QueryInterface(Ci.nsIXMLHttpRequest); | |
| 28 request.open("GET", aFeedURL, true); | |
| 29 request.send(null); | |
| 30 }, | |
| 31 | |
| 32 onLoad: function(aEvent) { | |
| 33 let request = aEvent.target; | |
| 34 | |
| 35 if (request.responseText.length > 0) { | |
| 36 let parser = Cc["@mozilla.org/feed-processor;1"]. | |
| 37 createInstance(Ci.nsIFeedProcessor); | |
| 38 parser.listener = new SnowlFeed(request.channel.originalURI); | |
| 39 parser.parseFromString(request.responseText, request.channel.URI); | |
| 40 } | |
| 41 }, | |
| 42 | |
| 43 onError: function(aEvent) { | |
| 44 // FIXME: figure out what to do here. | |
| 21 | 45 Log4Moz.Service.getLogger("Snowl.FeedClient").error("loading feed " + aEvent.target.channel.originalURI.spec); |
| 14 | 46 } |
| 47 }; | |
| 48 | |
| 49 function SnowlFeed(aID, aURL, aTitle) { | |
| 50 this.id = aID; | |
| 51 this.url = aURL; | |
| 52 this.title = aTitle; | |
| 53 | |
| 54 this._log = Log4Moz.Service.getLogger("Snowl.Feed"); | |
| 55 } | |
| 56 | |
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update the sources table schema, changing the title column to name and differentiating between machine-processable and human-readable URIs
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57 // FIXME: make this a subclass of SnowlSource. |
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58 |
| 14 | 59 SnowlFeed.prototype = { |
| 60 id: null, | |
| 61 url: null, | |
| 62 title: null, | |
| 63 | |
| 64 _log: null, | |
| 65 | |
| 66 QueryInterface: function(aIID) { | |
| 67 if (aIID.equals(Ci.nsIFeedResultListener) || | |
| 68 aIID.equals(Ci.nsISupports)) | |
| 69 return this; | |
| 70 | |
| 71 throw Cr.NS_ERROR_NO_INTERFACE; | |
| 72 }, | |
| 73 | |
| 74 // nsIFeedResultListener | |
| 75 | |
| 76 handleResult: function(result) { | |
| 77 // Now that we know we successfully downloaded the feed and obtained | |
| 78 // a result from it, update the "last refreshed" timestamp. | |
| 79 this.resetLastRefreshed(this); | |
| 80 | |
| 81 let feed = result.doc.QueryInterface(Components.interfaces.nsIFeed); | |
| 82 | |
| 83 let currentMessages = []; | |
| 84 | |
| 85 SnowlDatastore.dbConnection.beginTransaction(); | |
| 86 try { | |
| 87 for (let i = 0; i < feed.items.length; i++) { | |
| 88 let entry = feed.items.queryElementAt(i, Ci.nsIFeedEntry); | |
| 89 //entry.QueryInterface(Ci.nsIFeedContainer); | |
| 90 | |
| 91 // Figure out the ID for the entry, then check if the entry has already | |
| 92 // been retrieved. If we can't figure out the entry's ID, then we skip | |
| 93 // the entry, since its ID is the only way for us to know whether or not | |
| 94 // it has already been retrieved. | |
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95 let externalID; |
| 14 | 96 try { |
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97 externalID = entry.id || this.generateID(entry); |
| 14 | 98 } |
| 99 catch(ex) { | |
| 100 this._log.warn(this.title + " couldn't retrieve a message: " + ex); | |
| 101 continue; | |
| 102 } | |
| 103 | |
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104 let internalID = this.getInternalIDForExternalID(externalID); |
| 14 | 105 |
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106 if (internalID) { |
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107 //this._log.info(this.title + " has message " + externalID); |
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108 } |
| 14 | 109 else { |
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110 this._log.info(this.title + " adding message " + externalID); |
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111 internalID = this.addMessage(entry, externalID); |
| 14 | 112 } |
| 113 | |
| 114 currentMessages.push(internalID); | |
| 115 } | |
| 116 | |
| 117 // Update the current flag. | |
| 118 SnowlDatastore.dbConnection.executeSimpleSQL("UPDATE messages SET current = 0 WHERE sourceID = " + this.id); | |
| 119 SnowlDatastore.dbConnection.executeSimpleSQL("UPDATE messages SET current = 1 WHERE sourceID = " + this.id + " AND id IN (" + currentMessages.join(", ") + ")"); | |
| 120 | |
| 121 SnowlDatastore.dbConnection.commitTransaction(); | |
| 122 } | |
| 123 catch(ex) { | |
| 124 SnowlDatastore.dbConnection.rollbackTransaction(); | |
| 125 throw ex; | |
| 126 } | |
| 127 }, | |
| 128 | |
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129 // nsIFeedTextConstruct::type to media type mappings. |
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130 mediaTypes: { html: "text/html", xhtml: "application/xhtml+xml", text: "text/plain" }, |
| 14 | 131 |
| 132 getNewMessages: function() { | |
| 133 let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(); | |
| 134 | |
| 135 request.QueryInterface(Ci.nsIDOMEventTarget); | |
| 136 // FIXME: just pass "this" and make this implement nsIDOMEventListener. | |
| 137 let t = this; | |
| 138 request.addEventListener("load", function(aEvent) { t.onLoad(aEvent) }, false); | |
| 139 request.addEventListener("error", function(aEvent) { t.onError(aEvent) }, false); | |
| 140 | |
| 141 request.QueryInterface(Ci.nsIXMLHttpRequest); | |
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142 //dump("about to getNewMessages for " + this.url + "\n"); |
| 14 | 143 request.open("GET", this.url, true); |
| 144 request.send(null); | |
| 145 }, | |
| 146 | |
| 147 onLoad: function(aEvent) { | |
| 148 let request = aEvent.target; | |
| 149 | |
| 150 if (request.responseText.length > 0) { | |
| 151 let parser = Cc["@mozilla.org/feed-processor;1"]. | |
| 152 createInstance(Ci.nsIFeedProcessor); | |
| 153 parser.listener = this; | |
| 154 parser.parseFromString(request.responseText, request.channel.URI); | |
| 155 } | |
| 156 }, | |
| 157 | |
| 158 onError: function(aEvent) { | |
| 159 // FIXME: figure out what to do here. | |
| 160 this._log.error("loading feed " + aEvent.target.channel.originalURI); | |
| 161 }, | |
| 162 | |
| 163 /** | |
| 164 * Add a message to the datastore for the given feed entry. | |
| 165 * | |
| 166 * @param aEntry {nsIFeedEntry} the feed entry | |
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167 * @param aExternalID {string} the external ID of the feed entry |
| 14 | 168 */ |
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169 addMessage: function(aEntry, aExternalID) { |
| 14 | 170 // Combine the first author's name and email address into a single string |
| 171 // that we'll use as the author of the message. | |
| 172 let author = null; | |
| 173 if (aEntry.authors.length > 0) { | |
| 174 let firstAuthor = aEntry.authors.queryElementAt(0, Ci.nsIFeedPerson); | |
| 175 let name = firstAuthor.name; | |
| 176 let email = firstAuthor.email; | |
| 177 if (name) { | |
| 178 author = name; | |
| 179 if (email) | |
| 180 author += " <" + email + ">"; | |
| 181 } | |
| 182 else if (email) | |
| 183 author = email; | |
| 184 } | |
| 185 | |
| 186 // Convert the publication date/time string into a JavaScript Date object. | |
| 187 let timestamp = aEntry.published ? new Date(aEntry.published) : null; | |
| 188 | |
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189 // FIXME: wrap all queries that add the message into a transaction? |
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190 |
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191 // FIXME: handle titles that contain markup or are missing. |
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192 let messageID = this.addSimpleMessage(this.id, aExternalID, |
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193 aEntry.title.text, author, |
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194 timestamp, aEntry.link); |
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195 |
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196 // Add parts |
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197 if (aEntry.content) { |
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198 this.addPart(messageID, PART_TYPE_CONTENT, aEntry.content.text, |
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199 (aEntry.content.base ? aEntry.content.base.spec : null), |
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200 aEntry.content.lang, this.mediaTypes[aEntry.content.type]); |
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201 } |
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202 |
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203 if (aEntry.summary) { |
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204 this.addPart(messageID, PART_TYPE_SUMMARY, aEntry.summary.text, |
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205 (aEntry.summary.base ? aEntry.summary.base.spec : null), |
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206 aEntry.summary.lang, this.mediaTypes[aEntry.summary.type]); |
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207 } |
| 14 | 208 |
| 209 // Add metadata. | |
| 210 let fields = aEntry.QueryInterface(Ci.nsIFeedContainer). | |
| 211 fields.QueryInterface(Ci.nsIPropertyBag).enumerator; | |
| 212 while (fields.hasMoreElements()) { | |
| 213 let field = fields.getNext().QueryInterface(Ci.nsIProperty); | |
| 214 | |
| 215 if (field.name == "authors") { | |
| 216 let values = field.value.QueryInterface(Ci.nsIArray).enumerate(); | |
| 217 while (values.hasMoreElements()) { | |
| 218 let value = values.getNext().QueryInterface(Ci.nsIFeedPerson); | |
| 219 // FIXME: store people records in a separate table with individual | |
| 220 // columns for each person attribute (i.e. name, email, url)? | |
| 221 this.addMetadatum(messageID, | |
| 222 "atom:author", | |
| 223 value.name && value.email ? value.name + "<" + value.email + ">" | |
| 224 : value.name ? value.name : value.email); | |
| 225 } | |
| 226 } | |
| 227 | |
| 228 else if (field.name == "links") { | |
| 229 let values = field.value.QueryInterface(Ci.nsIArray).enumerate(); | |
| 230 while (values.hasMoreElements()) { | |
| 231 let value = values.getNext().QueryInterface(Ci.nsIPropertyBag2); | |
| 232 // FIXME: store link records in a separate table with individual | |
| 233 // colums for each link attribute (i.e. href, type, rel, title)? | |
| 234 this.addMetadatum(messageID, | |
| 235 "atom:link_" + value.get("rel"), | |
| 236 value.get("href")); | |
| 237 } | |
| 238 } | |
| 239 | |
| 240 // For some reason, the values of certain simple fields (like RSS2 guid) | |
| 241 // are property bags containing the value instead of the value itself. | |
| 242 // For those, we need to unwrap the extra layer. This strange behavior | |
| 243 // has been filed as bug 427907. | |
| 244 else if (typeof field.value == "object") { | |
| 245 if (field.value instanceof Ci.nsIPropertyBag2) { | |
| 246 let value = field.value.QueryInterface(Ci.nsIPropertyBag2).get(field.name); | |
| 247 this.addMetadatum(messageID, field.name, value); | |
| 248 } | |
| 249 else if (field.value instanceof Ci.nsIArray) { | |
| 250 let values = field.value.QueryInterface(Ci.nsIArray).enumerate(); | |
| 251 while (values.hasMoreElements()) { | |
| 252 let value = values.getNext().QueryInterface(Ci.nsIPropertyBag2); | |
| 253 this.addMetadatum(messageID, field.name, value.get(field.name)); | |
| 254 } | |
| 255 } | |
| 256 } | |
| 257 | |
| 258 else | |
| 259 this.addMetadatum(messageID, field.name, field.value); | |
| 260 } | |
| 261 | |
| 262 return messageID; | |
| 263 }, | |
| 264 | |
| 265 /** | |
| 266 * Convert a string to an array of character codes. | |
| 267 * | |
| 268 * @param string {string} the string to convert | |
| 269 * @returns {array} the array of character codes | |
| 270 */ | |
| 271 stringToArray: function(string) { | |
| 272 var array = []; | |
| 273 for (let i = 0; i < string.length; i++) | |
| 274 array.push(string.charCodeAt(i)); | |
| 275 return array; | |
| 276 }, | |
| 277 | |
| 278 /** | |
| 279 * Given an entry, generate an ID for it based on a hash of its link, | |
| 280 * published, and title attributes. Useful for uniquely identifying entries | |
| 281 * that don't provide their own IDs. | |
| 282 * | |
| 283 * @param entry {nsIFeedEntry} the entry for which to generate an ID | |
| 284 * @returns {string} an ID for the entry | |
| 285 */ | |
| 286 generateID: function(entry) { | |
| 287 let hasher = Cc["@mozilla.org/security/hash;1"]. | |
| 288 createInstance(Ci.nsICryptoHash); | |
| 289 hasher.init(Ci.nsICryptoHash.SHA1); | |
| 290 let identity = this.stringToArray(entry.link.spec + entry.published + entry.title.text); | |
| 291 hasher.update(identity, identity.length); | |
| 292 return "urn:" + hasher.finish(true); | |
| 293 }, | |
| 294 | |
| 295 // FIXME: Make the rest of this stuff be part of a superclass from which | |
| 296 // this class is derived. | |
| 297 | |
| 298 /** | |
| 299 * Get the internal ID of the message with the given external ID. | |
| 300 * | |
| 301 * @param aExternalID {string} | |
| 302 * the external ID of the message | |
| 303 * | |
| 304 * @returns {number} | |
| 305 * the internal ID of the message, or undefined if the message | |
| 306 * doesn't exist | |
| 307 */ | |
| 308 getInternalIDForExternalID: function(aExternalID) { | |
| 309 return SnowlDatastore.selectInternalIDForExternalID(aExternalID); | |
| 310 }, | |
| 311 | |
| 312 /** | |
| 313 * Add a message with a single part to the datastore. | |
| 314 * | |
| 315 * @param aSourceID {integer} the record ID of the message source | |
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316 * @param aExternalID {string} the external ID of the message |
| 14 | 317 * @param aSubject {string} the title of the message |
| 318 * @param aAuthor {string} the author of the message | |
| 319 * @param aTimestamp {Date} the date/time at which the message was sent | |
| 320 * @param aLink {nsIURI} a link to the content of the message, | |
| 321 * if the content is hosted on a server | |
| 322 * | |
| 323 * @returns {integer} the internal ID of the newly-created message | |
| 324 */ | |
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325 addSimpleMessage: function(aSourceID, aExternalID, aSubject, aAuthor, |
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326 aTimestamp, aLink) { |
| 14 | 327 // Convert the timestamp to milliseconds-since-epoch, which is how we store |
| 328 // it in the datastore. | |
| 329 let timestamp = aTimestamp ? aTimestamp.getTime() : null; | |
| 330 | |
| 331 // Convert the link to its string spec, which is how we store it | |
| 332 // in the datastore. | |
| 333 let link = aLink ? aLink.spec : null; | |
| 334 | |
| 335 let messageID = | |
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336 SnowlDatastore.insertMessage(aSourceID, aExternalID, aSubject, aAuthor, |
| 14 | 337 timestamp, link); |
| 338 | |
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339 return messageID; |
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340 }, |
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341 |
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342 get _addPartStatement() { |
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343 let statement = SnowlDatastore.createStatement( |
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344 "INSERT INTO parts(messageID, partType, content, baseURI, languageCode, mediaType) \ |
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345 VALUES (:messageID, :partType, :content, :baseURI, :languageCode, :mediaType)" |
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346 ); |
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347 this.__defineGetter__("_addPartStatement", function() { return statement }); |
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348 return this._addPartStatement; |
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349 }, |
| 14 | 350 |
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351 addPart: function(aMessageID, aPartType, aContent, aBaseURI, aLanguageCode, |
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352 aMediaType) { |
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353 this._addPartStatement.params.messageID = aMessageID; |
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354 this._addPartStatement.params.partType = aPartType; |
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355 this._addPartStatement.params.content = aContent; |
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356 this._addPartStatement.params.baseURI = aBaseURI; |
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357 this._addPartStatement.params.languageCode = aLanguageCode; |
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358 this._addPartStatement.params.mediaType = aMediaType; |
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359 this._addPartStatement.execute(); |
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360 |
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361 return SnowlDatastore.dbConnection.lastInsertRowID; |
| 14 | 362 }, |
| 363 | |
| 364 addMetadatum: function(aMessageID, aAttributeName, aValue) { | |
| 365 // FIXME: speed this up by caching the list of known attributes. | |
| 366 let attributeID = SnowlDatastore.selectAttributeID(aAttributeName) | |
| 367 || SnowlDatastore.insertAttribute(aAttributeName); | |
| 368 SnowlDatastore.insertMetadatum(aMessageID, attributeID, aValue); | |
| 369 }, | |
| 370 | |
| 371 /** | |
| 372 * Reset the last refreshed time for the given source to the current time. | |
| 373 * | |
| 374 * XXX should this be setLastRefreshed and take a time parameter | |
| 375 * to set the last refreshed time to? | |
| 376 * | |
| 377 * aSource {SnowlMessageSource} the source for which to set the time | |
| 378 */ | |
| 379 resetLastRefreshed: function() { | |
| 380 let stmt = SnowlDatastore.createStatement("UPDATE sources SET lastRefreshed = :lastRefreshed WHERE id = :id"); | |
| 381 stmt.params.lastRefreshed = new Date().getTime(); | |
| 382 stmt.params.id = this.id; | |
| 383 stmt.execute(); | |
| 384 } | |
| 385 | |
| 386 }; | |
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387 |
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388 // XXX Should we make this part of the Feed object? |
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389 // FIXME: make this accept a callback to which it reports on its progress |
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390 // so we can provide feedback to the user in subscription interfaces. |
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391 function SnowlFeedSubscriber(aURI, aName) { |
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392 this.uri = aURI; |
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393 this.name = aName; |
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394 } |
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395 |
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396 SnowlFeedSubscriber.prototype = { |
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397 uri: null, |
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398 name: null, |
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399 |
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400 // Observer Service |
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401 get _obsSvc() { |
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402 let obsSvc = Cc["@mozilla.org/observer-service;1"]. |
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403 getService(Ci.nsIObserverService); |
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404 this.__defineGetter__("_obsSvc", function() { return obsSvc }); |
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405 return this._obsSvc; |
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406 }, |
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407 |
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408 QueryInterface: function(aIID) { |
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409 if (aIID.equals(Ci.nsIDOMEventListener) || |
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410 aIID.equals(Ci.nsIFeedResultListener) || |
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411 aIID.equals(Ci.nsISupports)) |
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412 return this; |
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413 |
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414 throw Cr.NS_ERROR_NO_INTERFACE; |
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415 }, |
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416 |
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417 subscribe: function() { |
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418 let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(); |
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419 |
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420 request = request.QueryInterface(Ci.nsIDOMEventTarget); |
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421 request.addEventListener("load", this, false); |
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422 request.addEventListener("error", this, false); |
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423 |
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424 request = request.QueryInterface(Ci.nsIXMLHttpRequest); |
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425 |
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426 // The feed processor is going to parse the XML, so set the MIME type |
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427 // in order to turn off parsing by XMLHttpRequest itself. |
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428 request.overrideMimeType("text/plain"); |
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429 |
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430 request.open("GET", this.uri.spec, true); |
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431 request.send(null); |
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432 }, |
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433 |
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434 // nsIDOMEventListener |
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435 |
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436 handleEvent: function(aEvent) { |
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437 switch(aEvent.type) { |
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438 case "load": |
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439 this.onLoad(aEvent); |
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440 break; |
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441 case "error": |
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442 this.onError(aEvent); |
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443 break; |
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444 } |
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445 }, |
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447 onError: function(aEvent) { |
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448 dump("XMLHTTPRequest.onError for " + this.name + " <" + this.uri.spec + ">: " + aEvent.target.status + " " + aEvent.target.statusText + " " + aEvent.target.responseText.length + "\n"); |
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449 }, |
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450 |
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451 onLoad: function(aEvent) { |
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452 let request = aEvent.target; |
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453 |
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454 // FIXME: notify the user about the problem. |
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455 if (request.responseText.length == 0) |
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456 throw("feed contains no data"); |
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457 |
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458 let parser = Cc["@mozilla.org/feed-processor;1"]. |
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459 createInstance(Ci.nsIFeedProcessor); |
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460 parser.listener = this; |
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461 parser.parseFromString(request.responseText, request.channel.URI); |
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462 }, |
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463 |
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464 // nsIFeedResultListener |
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465 |
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466 handleResult: function(aResult) { |
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467 let feed = aResult.doc.QueryInterface(Components.interfaces.nsIFeed); |
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468 |
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469 // Subscribe to the feed. |
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470 let name = this.name || feed.title.plainText(); |
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471 let statement = SnowlDatastore.createStatement("INSERT INTO sources (name, machineURI, humanURI) VALUES (:name, :machineURI, :humanURI)"); |
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472 statement.params.name = name; |
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473 statement.params.machineURI = this.uri.spec; |
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474 statement.params.humanURI = feed.link.spec; |
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475 //dump("subscribing to " + name + " <" + this.uri.spec + ">\n"); |
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476 statement.step(); |
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477 |
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478 let id = SnowlDatastore.dbConnection.lastInsertRowID; |
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479 |
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480 // Now refresh the feed to import all its items. |
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481 //dump("refreshing " + this.uri.spec + "\n"); |
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482 let feed2 = new SnowlFeed(id, this.uri.spec, name); |
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483 feed2.handleResult(aResult); |
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484 |
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485 this._obsSvc.notifyObservers(null, "sources:changed", null); |
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486 this._obsSvc.notifyObservers(null, "messages:changed", null); |
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487 } |
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488 |
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489 }; |