supported/FimfictionApi.java

   1 package be.nikiroo.fanfix.supported;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5 import java.net.URL;
   6 import java.util.AbstractMap;
   7 import java.util.ArrayList;
   8 import java.util.HashMap;
   9 import java.util.List;
  10 import java.util.Map;
  11 import java.util.Map.Entry;
  12 import java.util.TreeMap;
  13
  14 import org.jsoup.nodes.Document;
  15
  16 import be.nikiroo.fanfix.Instance;
  17 import be.nikiroo.fanfix.bundles.Config;
  18 import be.nikiroo.fanfix.data.MetaData;
  19 import be.nikiroo.fanfix.data.Story;
  20 import be.nikiroo.utils.IOUtils;
  21 import be.nikiroo.utils.Image;
  22 import be.nikiroo.utils.Progress;
  23
  24 /**
  25  * Support class for <a href="http://www.fimfiction.net/">FimFiction.net</a>
  26  * stories, a website dedicated to My Little Pony.
  27  * <p>
  28  * This version uses the new, official API of FimFiction.
  29  *
  30  * @author niki
  31  */
  32 class FimfictionApi extends BasicSupport {
  33         private String oauth;
  34         private String json;
  35
  36         private Map<Integer, String> chapterNames;
  37         private Map<Integer, String> chapterContents;
  38
  39         public FimfictionApi() throws IOException {
  40                 if (Instance.getInstance().getConfig().getBoolean(Config.LOGIN_FIMFICTION_APIKEY_FORCE_HTML, false)) {
  41                         throw new IOException("Configuration is set to force HTML scrapping");
  42                 }
  43
  44                 String oauth = Instance.getInstance().getConfig().getString(Config.LOGIN_FIMFICTION_APIKEY_TOKEN);
  45
  46                 if (oauth == null || oauth.isEmpty()) {
  47                         String clientId = Instance.getInstance().getConfig().getString(Config.LOGIN_FIMFICTION_APIKEY_CLIENT_ID)
  48                                         + "";
  49                         String clientSecret = Instance.getInstance().getConfig()
  50                                         .getString(Config.LOGIN_FIMFICTION_APIKEY_CLIENT_SECRET) + "";
  51
  52                         if (clientId.trim().isEmpty() || clientSecret.trim().isEmpty()) {
  53                                 throw new IOException("API key required for the beta API v2");
  54                         }
  55
  56                         oauth = generateOAuth(clientId, clientSecret);
  57
  58                         Instance.getInstance().getConfig().setString(Config.LOGIN_FIMFICTION_APIKEY_TOKEN, oauth);
  59                         Instance.getInstance().getConfig().updateFile();
  60                 }
  61
  62                 this.oauth = oauth;
  63         }
  64
  65         @Override
  66         protected Document loadDocument(URL source) throws IOException {
  67                 json = getJsonData();
  68                 return null;
  69         }
  70
  71         @Override
  72         public String getOAuth() {
  73                 return oauth;
  74         }
  75
  76         @Override
  77         protected boolean isHtml() {
  78                 return true;
  79         }
  80
  81         /**
  82          * Extract the full JSON data we will later use to build the {@link Story}.
  83          *
  84          * @return the data in a JSON format
  85          *
  86          * @throws IOException
  87          *             in case of I/O error
  88          */
  89         private String getJsonData() throws IOException {
  90                 // extract the ID from:
  91                 // https://www.fimfiction.net/story/123456/name-of-story
  92                 String storyId = getKeyText(getSource().toString(), "/story/", null,
  93                                 "/");
  94
  95                 // Selectors, so to download all I need and only what I need
  96                 String storyContent = "fields[story]=title,description,date_published,cover_image";
  97                 String authorContent = "fields[author]=name";
  98                 String chapterContent = "fields[chapter]=chapter_number,title,content_html,authors_note_html";
  99                 String includes = "author,chapters,tags";
 100
 101                 String urlString = String.format(
 102                                 "https://www.fimfiction.net/api/v2/stories/%s?" //
 103                                                 + "%s&%s&%s&" //
 104                                                 + "include=%s", //
 105                                 storyId, //
 106                                 storyContent, authorContent, chapterContent,//
 107                                 includes);
 108
 109                 // URL params must be URL-encoded: "[ ]" <-> "%5B %5D"
 110                 urlString = urlString.replace("[", "%5B").replace("]", "%5D");
 111
 112                 URL url = new URL(urlString);
 113                 InputStream jsonIn = Instance.getInstance().getCache().open(url, this, false);
 114                 try {
 115                         return IOUtils.readSmallStream(jsonIn);
 116                 } finally {
 117                         jsonIn.close();
 118                 }
 119         }
 120
 121         @Override
 122         protected MetaData getMeta() throws IOException {
 123                 MetaData meta = new MetaData();
 124
 125                 meta.setTitle(getKeyJson(json, 0, "type", "story", "title"));
 126                 meta.setAuthor(getKeyJson(json, 0, "type", "user", "name"));
 127                 meta.setDate(bsHelper.formatDate(
 128                                 getKeyJson(json, 0, "type", "story", "date_published")));
 129                 meta.setTags(getTags());
 130                 meta.setUrl(getSource().toString());
 131                 meta.setUuid(getSource().toString());
 132                 meta.setLuid("");
 133                 meta.setLang("en");
 134                 meta.setSubject("MLP");
 135                 meta.setImageDocument(false);
 136
 137                 String coverImageLink = getKeyJson(json, 0, "type", "story",
 138                                 "cover_image", "full");
 139                 if (!coverImageLink.trim().isEmpty()) {
 140                         URL coverImageUrl = new URL(coverImageLink.trim());
 141
 142                         // No need to use the oauth, cookies... for the cover
 143                         // Plus: it crashes on Android because of the referer
 144                         try {
 145                                 InputStream in = Instance.getInstance().getCache().open(coverImageUrl, null, true);
 146                                 try {
 147                                         Image img = new Image(in);
 148                                         if (img.getSize() == 0) {
 149                                                 img.close();
 150                                                 throw new IOException(
 151                                                                 "Empty image not accepted");
 152                                         }
 153                                         meta.setCover(img);
 154                                 } finally {
 155                                         in.close();
 156                                 }
 157                         } catch (IOException e) {
 158                                 Instance.getInstance().getTraceHandler()
 159                                                 .error(new IOException("Cannot get the story cover, ignoring...", e));
 160                         }
 161                 }
 162
 163                 return meta;
 164         }
 165
 166         private List<String> getTags() {
 167                 List<String> tags = new ArrayList<String>();
 168                 tags.add("MLP");
 169
 170                 int pos = 0;
 171                 while (pos >= 0) {
 172                         pos = indexOfJsonAfter(json, pos, "type", "story_tag");
 173                         if (pos >= 0) {
 174                                 tags.add(getKeyJson(json, pos, "name").trim());
 175                         }
 176                 }
 177
 178                 return tags;
 179         }
 180
 181         @Override
 182         protected String getDesc() {
 183                 String desc = getKeyJson(json, 0, "type", "story", "description");
 184                 return unbbcode(desc);
 185         }
 186
 187         @Override
 188         protected List<Entry<String, URL>> getChapters(Progress pg) {
 189                 chapterNames = new TreeMap<Integer, String>();
 190                 chapterContents = new TreeMap<Integer, String>();
 191
 192                 int pos = 0;
 193                 while (pos >= 0) {
 194                         pos = indexOfJsonAfter(json, pos, "type", "chapter");
 195                         if (pos >= 0) {
 196                                 int posNumber = indexOfJsonAfter(json, pos, "chapter_number");
 197                                 int posComa = json.indexOf(",", posNumber);
 198                                 final int number = Integer.parseInt(json.substring(posNumber,
 199                                                 posComa).trim());
 200                                 final String title = getKeyJson(json, pos, "title");
 201                                 String notes = getKeyJson(json, pos, "authors_note_html");
 202                                 String content = getKeyJson(json, pos, "content_html");
 203
 204                                 if (!notes.trim().isEmpty()) {
 205                                         notes = "<br/>* * *<br/>" + notes;
 206                                 }
 207
 208                                 chapterNames.put(number, title);
 209                                 chapterContents.put(number, content + notes);
 210                         }
 211                 }
 212
 213                 List<Entry<String, URL>> urls = new ArrayList<Entry<String, URL>>();
 214                 for (String title : chapterNames.values()) {
 215                         urls.add(new AbstractMap.SimpleEntry<String, URL>(title, null));
 216                 }
 217
 218                 return urls;
 219         }
 220
 221         @Override
 222         protected String getChapterContent(URL source, int number, Progress pg) {
 223                 return chapterContents.get(number);
 224         }
 225
 226         @Override
 227         protected boolean supports(URL url) {
 228                 return "fimfiction.net".equals(url.getHost())
 229                                 || "www.fimfiction.net".equals(url.getHost());
 230         }
 231
 232         /**
 233          * Generate a new token from the client ID and secret.
 234          * <p>
 235          * Note that those tokens are long-lived, and it would be badly seen to
 236          * create a lot of them without due cause.
 237          * <p>
 238          * So, please cache and re-use them.
 239          *
 240          * @param clientId
 241          *            the client ID offered on FimFiction
 242          * @param clientSecret
 243          *            the client secret that goes with it
 244          *
 245          * @return a new generated token linked to that client ID
 246          *
 247          * @throws IOException
 248          *             in case of I/O errors
 249          */
 250         static private String generateOAuth(String clientId, String clientSecret)
 251                         throws IOException {
 252                 URL url = new URL("https://www.fimfiction.net/api/v2/token");
 253                 Map<String, String> params = new HashMap<String, String>();
 254                 params.put("client_id", clientId);
 255                 params.put("client_secret", clientSecret);
 256                 params.put("grant_type", "client_credentials");
 257                 InputStream in = Instance.getInstance().getCache().openNoCache(url, null, params, null, null);
 258
 259                 String jsonToken = IOUtils.readSmallStream(in);
 260                 in.close();
 261
 262                 // Extract token type and token from: {
 263                 // token_type = "Bearer",
 264                 // access_token = "xxxxxxxxxxxxxx"
 265                 // }
 266
 267                 String tokenType = getKeyText(jsonToken, "\"token_type\"", "\"", "\"");
 268                 String token = getKeyText(jsonToken, "\"access_token\"", "\"", "\"");
 269
 270                 return tokenType + " " + token;
 271         }
 272
 273         // afters: [name, value] pairs (or "" for any of them), can end without
 274         // value
 275         static private int indexOfJsonAfter(String json, int startAt,
 276                         String... afterKeys) {
 277                 ArrayList<String> afters = new ArrayList<String>();
 278                 boolean name = true;
 279                 for (String key : afterKeys) {
 280                         if (key != null && !key.isEmpty()) {
 281                                 afters.add("\"" + key + "\"");
 282                         } else {
 283                                 afters.add("\"");
 284                                 afters.add("\"");
 285                         }
 286
 287                         if (name) {
 288                                 afters.add(":");
 289                         }
 290
 291                         name = !name;
 292                 }
 293
 294                 return indexOfAfter(json, startAt, afters.toArray(new String[] {}));
 295         }
 296
 297         // afters: [name, value] pairs (or "" for any of them), can end without
 298         // value but will then be empty, not NULL
 299         static private String getKeyJson(String json, int startAt,
 300                         String... afterKeys) {
 301                 int pos = indexOfJsonAfter(json, startAt, afterKeys);
 302                 if (pos < 0) {
 303                         return "";
 304                 }
 305
 306                 String result = "";
 307                 String wip = json.substring(pos);
 308
 309                 pos = nextUnescapedQuote(wip, 0);
 310                 if (pos >= 0) {
 311                         wip = wip.substring(pos + 1);
 312                         pos = nextUnescapedQuote(wip, 0);
 313                         if (pos >= 0) {
 314                                 result = wip.substring(0, pos);
 315                         }
 316                 }
 317
 318                 result = result.replace("\\t", "\t").replace("\\\"", "\"");
 319
 320                 return result;
 321         }
 322
 323         // next " but don't take \" into account
 324         static private int nextUnescapedQuote(String result, int pos) {
 325                 while (pos >= 0) {
 326                         pos = result.indexOf("\"", pos);
 327                         if (pos == 0 || (pos > 0 && result.charAt(pos - 1) != '\\')) {
 328                                 break;
 329                         }
 330
 331                         if (pos < result.length()) {
 332                                 pos++;
 333                         }
 334                 }
 335
 336                 return pos;
 337         }
 338
 339         // quick & dirty filter
 340         static private String unbbcode(String bbcode) {
 341                 String text = bbcode.replace("\\r\\n", "<br/>") //
 342                                 .replace("[i]", "_").replace("[/i]", "_") //
 343                                 .replace("[b]", "*").replace("[/b]", "*") //
 344                                 .replaceAll("\\[[^\\]]*\\]", "");
 345                 return text;
 346         }
 347
 348         /**
 349          * Return the text between the key and the endKey (and optional subKey can
 350          * be passed, in this case we will look for the key first, then take the
 351          * text between the subKey and the endKey).
 352          *
 353          * @param in
 354          *            the input
 355          * @param key
 356          *            the key to match (also supports "^" at start to say
 357          *            "only if it starts with" the key)
 358          * @param subKey
 359          *            the sub key or NULL if none
 360          * @param endKey
 361          *            the end key or NULL for "up to the end"
 362          * @return the text or NULL if not found
 363          */
 364         static private String getKeyText(String in, String key, String subKey,
 365                         String endKey) {
 366                 String result = null;
 367
 368                 String line = in;
 369                 if (line != null && line.contains(key)) {
 370                         line = line.substring(line.indexOf(key) + key.length());
 371                         if (subKey == null || subKey.isEmpty() || line.contains(subKey)) {
 372                                 if (subKey != null) {
 373                                         line = line.substring(line.indexOf(subKey)
 374                                                         + subKey.length());
 375                                 }
 376                                 if (endKey == null || line.contains(endKey)) {
 377                                         if (endKey != null) {
 378                                                 line = line.substring(0, line.indexOf(endKey));
 379                                                 result = line;
 380                                         }
 381                                 }
 382                         }
 383                 }
 384
 385                 return result;
 386         }
 387
 388         /**
 389          * Return the first index after all the given "afters" have been found in
 390          * the {@link String}, or -1 if it was not possible.
 391          *
 392          * @param in
 393          *            the input
 394          * @param startAt
 395          *            start at this position in the string
 396          * @param afters
 397          *            the sub-keys to find before checking for key/endKey
 398          *
 399          * @return the text or NULL if not found
 400          */
 401         static private int indexOfAfter(String in, int startAt, String... afters) {
 402                 int pos = -1;
 403                 if (in != null && !in.isEmpty()) {
 404                         pos = startAt;
 405                         if (afters != null) {
 406                                 for (int i = 0; pos >= 0 && i < afters.length; i++) {
 407                                         String subKey = afters[i];
 408                                         if (!subKey.isEmpty()) {
 409                                                 pos = in.indexOf(subKey, pos);
 410                                                 if (pos >= 0) {
 411                                                         pos += subKey.length();
 412                                                 }
 413                                         }
 414                                 }
 415                         }
 416                 }
 417
 418                 return pos;
 419         }
 420 }