Mercurial > snowl
annotate extension/modules/feed.js @ 116:cb8bbdf99268
getNewMessages -> refresh
| author | Myk Melez <myk@mozilla.org> |
|---|---|
| date | Sun, 01 Jun 2008 17:52:37 -0700 |
| parents | 9556a63bfbda |
| children | 31fedd0b1466 |
| rev | line source |
|---|---|
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1 EXPORTED_SYMBOLS = ["SnowlFeed"]; |
| 14 | 2 |
| 3 const Cc = Components.classes; | |
| 4 const Ci = Components.interfaces; | |
| 5 const Cr = Components.results; | |
| 6 const Cu = Components.utils; | |
| 7 | |
| 114 | 8 Cu.import("resource://snowl/modules/log4moz.js"); |
| 9 Cu.import("resource://snowl/modules/datastore.js"); | |
| 10 Cu.import("resource://snowl/modules/URI.js"); | |
| 11 Cu.import("resource://snowl/modules/source.js"); | |
| 12 | |
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13 // FIXME: factor this out into a common file. |
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14 const PART_TYPE_CONTENT = 1; |
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15 const PART_TYPE_SUMMARY = 2; |
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16 |
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17 // nsIFeedTextConstruct::type to media type mappings. |
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18 const mediaTypes = { html: "text/html", |
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19 xhtml: "application/xhtml+xml", |
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20 text: "text/plain" }; |
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21 |
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22 function SnowlFeed(aID, aName, aMachineURI, aHumanURI, aLastRefreshed, aImportance) { |
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23 // Call the superclass's constructor to initialize the new instance. |
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24 SnowlSource.call(this, aID, aName, aMachineURI, aHumanURI, aLastRefreshed, aImportance); |
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25 } |
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26 |
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27 SnowlFeed.prototype = { |
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28 __proto__: SnowlSource.prototype, |
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29 |
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30 _log: Log4Moz.Service.getLogger("Snowl.Feed"), |
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31 |
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32 // Observer Service |
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33 get _obsSvc() { |
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34 let obsSvc = Cc["@mozilla.org/observer-service;1"]. |
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35 getService(Ci.nsIObserverService); |
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36 this.__defineGetter__("_obsSvc", function() { return obsSvc }); |
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37 return this._obsSvc; |
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38 }, |
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39 |
| 116 | 40 refresh: function() { |
| 14 | 41 let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(); |
| 42 | |
| 43 request.QueryInterface(Ci.nsIDOMEventTarget); | |
| 44 let t = this; | |
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45 request.addEventListener("load", function(e) { t.onRefreshLoad(e) }, false); |
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46 request.addEventListener("error", function(e) { t.onRefreshError(e) }, false); |
| 14 | 47 |
| 48 request.QueryInterface(Ci.nsIXMLHttpRequest); | |
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49 |
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50 // The feed processor is going to parse the XML, so override the MIME type |
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51 // in order to turn off parsing by XMLHttpRequest itself. |
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52 request.overrideMimeType("text/plain"); |
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53 |
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54 request.open("GET", this.machineURI.spec, true); |
| 14 | 55 request.send(null); |
| 56 }, | |
| 57 | |
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58 onRefreshLoad: function(aEvent) { |
| 14 | 59 let request = aEvent.target; |
| 60 | |
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61 // XXX What's the right way to handle this? |
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62 if (request.responseText.length == 0) |
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63 throw("feed contains no data"); |
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64 |
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65 let parser = Cc["@mozilla.org/feed-processor;1"]. |
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66 createInstance(Ci.nsIFeedProcessor); |
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67 parser.listener = { t: this, handleResult: function(r) { this.t.onRefreshResult(r) } }; |
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68 parser.parseFromString(request.responseText, request.channel.URI); |
| 14 | 69 }, |
| 70 | |
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71 onRefreshError: function(aEvent) { |
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72 this._log.error("onRefreshError: " + aEvent.target.status + " " + |
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73 aEvent.target.statusText + " " + aEvent.target.responseText.length); |
| 14 | 74 }, |
| 75 | |
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76 onRefreshResult: function(aResult) { |
| 14 | 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 | |
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81 let feed = aResult.doc.QueryInterface(Components.interfaces.nsIFeed); |
| 14 | 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) { | |
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100 this._log.warn(this.name + " couldn't retrieve a message: " + ex); |
| 14 | 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.name + " has message " + externalID); |
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108 } |
| 14 | 109 else { |
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110 this._log.info(this.name + " 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 } | |
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127 |
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128 // FIXME: only do this if something has actually changed. |
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129 this._obsSvc.notifyObservers(null, "messages:changed", null); |
| 14 | 130 }, |
| 131 | |
| 132 /** | |
| 133 * Add a message to the datastore for the given feed entry. | |
| 134 * | |
| 135 * @param aEntry {nsIFeedEntry} the feed entry | |
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136 * @param aExternalID {string} the external ID of the feed entry |
| 14 | 137 */ |
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138 addMessage: function(aEntry, aExternalID) { |
| 14 | 139 // Combine the first author's name and email address into a single string |
| 140 // that we'll use as the author of the message. | |
| 141 let author = null; | |
| 142 if (aEntry.authors.length > 0) { | |
| 143 let firstAuthor = aEntry.authors.queryElementAt(0, Ci.nsIFeedPerson); | |
| 144 let name = firstAuthor.name; | |
| 145 let email = firstAuthor.email; | |
| 146 if (name) { | |
| 147 author = name; | |
| 148 if (email) | |
| 149 author += " <" + email + ">"; | |
| 150 } | |
| 151 else if (email) | |
| 152 author = email; | |
| 153 } | |
| 154 | |
| 155 // Convert the publication date/time string into a JavaScript Date object. | |
| 156 let timestamp = aEntry.published ? new Date(aEntry.published) : null; | |
| 157 | |
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158 // FIXME: wrap all queries that add the message into a transaction? |
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159 |
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160 // FIXME: handle titles that contain markup or are missing. |
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161 let messageID = this.addSimpleMessage(this.id, aExternalID, |
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162 aEntry.title.text, author, |
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163 timestamp, aEntry.link); |
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164 |
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165 // Add parts |
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166 if (aEntry.content) { |
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167 this.addPart(messageID, PART_TYPE_CONTENT, aEntry.content.text, |
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168 (aEntry.content.base ? aEntry.content.base.spec : null), |
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169 aEntry.content.lang, mediaTypes[aEntry.content.type]); |
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170 } |
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171 |
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172 if (aEntry.summary) { |
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173 this.addPart(messageID, PART_TYPE_SUMMARY, aEntry.summary.text, |
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174 (aEntry.summary.base ? aEntry.summary.base.spec : null), |
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175 aEntry.summary.lang, mediaTypes[aEntry.summary.type]); |
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176 } |
| 14 | 177 |
| 178 // Add metadata. | |
| 179 let fields = aEntry.QueryInterface(Ci.nsIFeedContainer). | |
| 180 fields.QueryInterface(Ci.nsIPropertyBag).enumerator; | |
| 181 while (fields.hasMoreElements()) { | |
| 182 let field = fields.getNext().QueryInterface(Ci.nsIProperty); | |
| 183 | |
| 184 if (field.name == "authors") { | |
| 185 let values = field.value.QueryInterface(Ci.nsIArray).enumerate(); | |
| 186 while (values.hasMoreElements()) { | |
| 187 let value = values.getNext().QueryInterface(Ci.nsIFeedPerson); | |
| 188 // FIXME: store people records in a separate table with individual | |
| 189 // columns for each person attribute (i.e. name, email, url)? | |
| 190 this.addMetadatum(messageID, | |
| 191 "atom:author", | |
| 192 value.name && value.email ? value.name + "<" + value.email + ">" | |
| 193 : value.name ? value.name : value.email); | |
| 194 } | |
| 195 } | |
| 196 | |
| 197 else if (field.name == "links") { | |
| 198 let values = field.value.QueryInterface(Ci.nsIArray).enumerate(); | |
| 199 while (values.hasMoreElements()) { | |
| 200 let value = values.getNext().QueryInterface(Ci.nsIPropertyBag2); | |
| 201 // FIXME: store link records in a separate table with individual | |
| 202 // colums for each link attribute (i.e. href, type, rel, title)? | |
| 203 this.addMetadatum(messageID, | |
| 204 "atom:link_" + value.get("rel"), | |
| 205 value.get("href")); | |
| 206 } | |
| 207 } | |
| 208 | |
| 209 // For some reason, the values of certain simple fields (like RSS2 guid) | |
| 210 // are property bags containing the value instead of the value itself. | |
| 211 // For those, we need to unwrap the extra layer. This strange behavior | |
| 212 // has been filed as bug 427907. | |
| 213 else if (typeof field.value == "object") { | |
| 214 if (field.value instanceof Ci.nsIPropertyBag2) { | |
| 215 let value = field.value.QueryInterface(Ci.nsIPropertyBag2).get(field.name); | |
| 216 this.addMetadatum(messageID, field.name, value); | |
| 217 } | |
| 218 else if (field.value instanceof Ci.nsIArray) { | |
| 219 let values = field.value.QueryInterface(Ci.nsIArray).enumerate(); | |
| 220 while (values.hasMoreElements()) { | |
| 221 let value = values.getNext().QueryInterface(Ci.nsIPropertyBag2); | |
| 222 this.addMetadatum(messageID, field.name, value.get(field.name)); | |
| 223 } | |
| 224 } | |
| 225 } | |
| 226 | |
| 227 else | |
| 228 this.addMetadatum(messageID, field.name, field.value); | |
| 229 } | |
| 230 | |
| 231 return messageID; | |
| 232 }, | |
| 233 | |
| 234 /** | |
| 235 * Convert a string to an array of character codes. | |
| 236 * | |
| 237 * @param string {string} the string to convert | |
| 238 * @returns {array} the array of character codes | |
| 239 */ | |
| 240 stringToArray: function(string) { | |
| 241 var array = []; | |
| 242 for (let i = 0; i < string.length; i++) | |
| 243 array.push(string.charCodeAt(i)); | |
| 244 return array; | |
| 245 }, | |
| 246 | |
| 247 /** | |
| 248 * Given an entry, generate an ID for it based on a hash of its link, | |
| 249 * published, and title attributes. Useful for uniquely identifying entries | |
| 250 * that don't provide their own IDs. | |
| 251 * | |
| 252 * @param entry {nsIFeedEntry} the entry for which to generate an ID | |
| 253 * @returns {string} an ID for the entry | |
| 254 */ | |
| 255 generateID: function(entry) { | |
| 256 let hasher = Cc["@mozilla.org/security/hash;1"]. | |
| 257 createInstance(Ci.nsICryptoHash); | |
| 258 hasher.init(Ci.nsICryptoHash.SHA1); | |
| 259 let identity = this.stringToArray(entry.link.spec + entry.published + entry.title.text); | |
| 260 hasher.update(identity, identity.length); | |
| 261 return "urn:" + hasher.finish(true); | |
| 262 }, | |
| 263 | |
| 264 // FIXME: Make the rest of this stuff be part of a superclass from which | |
| 265 // this class is derived. | |
| 266 | |
| 267 /** | |
| 268 * Get the internal ID of the message with the given external ID. | |
| 269 * | |
| 270 * @param aExternalID {string} | |
| 271 * the external ID of the message | |
| 272 * | |
| 273 * @returns {number} | |
| 274 * the internal ID of the message, or undefined if the message | |
| 275 * doesn't exist | |
| 276 */ | |
| 277 getInternalIDForExternalID: function(aExternalID) { | |
| 278 return SnowlDatastore.selectInternalIDForExternalID(aExternalID); | |
| 279 }, | |
| 280 | |
| 281 /** | |
| 282 * Add a message with a single part to the datastore. | |
| 283 * | |
| 284 * @param aSourceID {integer} the record ID of the message source | |
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285 * @param aExternalID {string} the external ID of the message |
| 14 | 286 * @param aSubject {string} the title of the message |
| 287 * @param aAuthor {string} the author of the message | |
| 288 * @param aTimestamp {Date} the date/time at which the message was sent | |
| 289 * @param aLink {nsIURI} a link to the content of the message, | |
| 290 * if the content is hosted on a server | |
| 291 * | |
| 292 * @returns {integer} the internal ID of the newly-created message | |
| 293 */ | |
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294 addSimpleMessage: function(aSourceID, aExternalID, aSubject, aAuthor, |
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295 aTimestamp, aLink) { |
| 14 | 296 // Convert the timestamp to milliseconds-since-epoch, which is how we store |
| 297 // it in the datastore. | |
| 298 let timestamp = aTimestamp ? aTimestamp.getTime() : null; | |
| 299 | |
| 300 // Convert the link to its string spec, which is how we store it | |
| 301 // in the datastore. | |
| 302 let link = aLink ? aLink.spec : null; | |
| 303 | |
| 304 let messageID = | |
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305 SnowlDatastore.insertMessage(aSourceID, aExternalID, aSubject, aAuthor, |
| 14 | 306 timestamp, link); |
| 307 | |
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308 return messageID; |
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309 }, |
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310 |
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311 get _addPartStatement() { |
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312 let statement = SnowlDatastore.createStatement( |
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313 "INSERT INTO parts(messageID, partType, content, baseURI, languageCode, mediaType) \ |
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314 VALUES (:messageID, :partType, :content, :baseURI, :languageCode, :mediaType)" |
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315 ); |
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316 this.__defineGetter__("_addPartStatement", function() { return statement }); |
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317 return this._addPartStatement; |
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318 }, |
| 14 | 319 |
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320 addPart: function(aMessageID, aPartType, aContent, aBaseURI, aLanguageCode, |
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321 aMediaType) { |
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322 this._addPartStatement.params.messageID = aMessageID; |
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323 this._addPartStatement.params.partType = aPartType; |
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324 this._addPartStatement.params.content = aContent; |
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325 this._addPartStatement.params.baseURI = aBaseURI; |
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326 this._addPartStatement.params.languageCode = aLanguageCode; |
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327 this._addPartStatement.params.mediaType = aMediaType; |
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328 this._addPartStatement.execute(); |
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329 |
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330 return SnowlDatastore.dbConnection.lastInsertRowID; |
| 14 | 331 }, |
| 332 | |
| 333 addMetadatum: function(aMessageID, aAttributeName, aValue) { | |
| 334 // FIXME: speed this up by caching the list of known attributes. | |
| 335 let attributeID = SnowlDatastore.selectAttributeID(aAttributeName) | |
| 336 || SnowlDatastore.insertAttribute(aAttributeName); | |
| 337 SnowlDatastore.insertMetadatum(aMessageID, attributeID, aValue); | |
| 338 }, | |
| 339 | |
| 340 /** | |
| 341 * Reset the last refreshed time for the given source to the current time. | |
| 342 * | |
| 343 * XXX should this be setLastRefreshed and take a time parameter | |
| 344 * to set the last refreshed time to? | |
| 345 * | |
| 346 * aSource {SnowlMessageSource} the source for which to set the time | |
| 347 */ | |
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348 // FIXME: make this a setter for the lastRefreshed property. |
| 14 | 349 resetLastRefreshed: function() { |
| 350 let stmt = SnowlDatastore.createStatement("UPDATE sources SET lastRefreshed = :lastRefreshed WHERE id = :id"); | |
| 351 stmt.params.lastRefreshed = new Date().getTime(); | |
| 352 stmt.params.id = this.id; | |
| 353 stmt.execute(); | |
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354 }, |
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355 |
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356 // FIXME: make this accept a callback to which it reports on its progress |
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357 // so we can provide feedback to the user in subscription interfaces. |
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358 subscribe: function() { |
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359 this._log.info("subscribing to " + this.name + " <" + this.machineURI.spec + ">"); |
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360 |
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361 let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(); |
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362 |
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363 request = request.QueryInterface(Ci.nsIDOMEventTarget); |
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364 |
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365 let t = this; |
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366 request.addEventListener("load", function(e) { t.onSubscribeLoad(e) }, false); |
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367 request.addEventListener("error", function(e) { t.onSubscribeError(e) }, false); |
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368 |
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369 request = request.QueryInterface(Ci.nsIXMLHttpRequest); |
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370 |
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371 // The feed processor is going to parse the XML, so override the MIME type |
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372 // in order to turn off parsing by XMLHttpRequest itself. |
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373 request.overrideMimeType("text/plain"); |
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374 |
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375 request.open("GET", this.machineURI.spec, true); |
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376 request.send(null); |
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377 }, |
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378 |
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379 onSubscribeLoad: function(aEvent) { |
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380 let request = aEvent.target; |
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381 |
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382 // XXX What's the right way to handle this? |
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383 if (request.responseText.length == 0) |
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384 throw("feed contains no data"); |
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385 |
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386 let parser = Cc["@mozilla.org/feed-processor;1"]. |
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387 createInstance(Ci.nsIFeedProcessor); |
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388 parser.listener = { t: this, handleResult: function(r) { this.t.onSubscribeResult(r) } }; |
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389 parser.parseFromString(request.responseText, request.channel.URI); |
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390 }, |
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391 |
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392 onSubscribeError: function(aEvent) { |
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393 this._log.error("onSubscribeError: " + aEvent.target.status + " " + |
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394 aEvent.target.statusText + " " + aEvent.target.responseText.length); |
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395 }, |
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396 |
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397 onSubscribeResult: function(aResult) { |
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398 let feed = aResult.doc.QueryInterface(Components.interfaces.nsIFeed); |
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399 |
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400 // Extract the name (if we don't already have one) and human URI from the feed. |
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401 if (!this.name) |
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402 this.name = feed.title.plainText(); |
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403 this.humanURI = feed.link; |
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404 |
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405 // Add the source to the database. |
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406 let statement = |
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407 SnowlDatastore.createStatement("INSERT INTO sources (name, machineURI, humanURI) " + |
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408 "VALUES (:name, :machineURI, :humanURI)"); |
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409 try { |
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410 statement.params.name = this.name; |
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411 statement.params.machineURI = this.machineURI.spec; |
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412 statement.params.humanURI = this.humanURI.spec; |
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413 statement.step(); |
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414 } |
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415 finally { |
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416 statement.reset(); |
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417 } |
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418 |
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419 // Extract the ID of the source from the newly-created database record. |
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420 this.id = SnowlDatastore.dbConnection.lastInsertRowID; |
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421 |
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422 // Let observers know about the new source. |
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423 this._obsSvc.notifyObservers(null, "sources:changed", null); |
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424 |
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425 // Refresh the feed to import all its items. |
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426 this.onRefreshResult(aResult); |
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427 } |
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428 |
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429 }; |