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.getConfig().getBoolean(
  41                                 Config.LOGIN_FIMFICTION_APIKEY_FORCE_HTML, false)) {
  42                         throw new IOException(
  43                                         "Configuration is set to force HTML scrapping");
  44                 }
  45
  46                 String oauth = Instance.getConfig().getString(
  47                                 Config.LOGIN_FIMFICTION_APIKEY_TOKEN);
  48
  49                 if (oauth == null || oauth.isEmpty()) {
  50                         String clientId = Instance.getConfig().getString(
  51                                         Config.LOGIN_FIMFICTION_APIKEY_CLIENT_ID)
  52                                         + "";
  53                         String clientSecret = Instance.getConfig().getString(
  54                                         Config.LOGIN_FIMFICTION_APIKEY_CLIENT_SECRET)
  55                                         + "";
  56
  57                         if (clientId.trim().isEmpty() || clientSecret.trim().isEmpty()) {
  58                                 throw new IOException("API key required for the beta API v2");
  59                         }
  60
  61                         oauth = generateOAuth(clientId, clientSecret);
  62
  63                         Instance.getConfig().setString(
  64                                         Config.LOGIN_FIMFICTION_APIKEY_TOKEN, oauth);
  65                         Instance.getConfig().updateFile();
  66                 }
  67
  68                 this.oauth = oauth;
  69         }
  70
  71         @Override
  72         protected Document loadDocument(URL source) throws IOException {
  73                 json = getJsonData();
  74                 return null;
  75         }
  76
  77         @Override
  78         public String getOAuth() {
  79                 return oauth;
  80         }
  81
  82         @Override
  83         protected boolean isHtml() {
  84                 return true;
  85         }
  86
  87         /**
  88          * Extract the full JSON data we will later use to build the {@link Story}.
  89          *
  90          * @return the data in a JSON format
  91          *
  92          * @throws IOException
  93          *             in case of I/O error
  94          */
  95         private String getJsonData() throws IOException {
  96                 // extract the ID from:
  97                 // https://www.fimfiction.net/story/123456/name-of-story
  98                 String storyId = getKeyText(getSource().toString(), "/story/", null,
  99                                 "/");
 100
 101                 // Selectors, so to download all I need and only what I need
 102                 String storyContent = "fields[story]=title,description,date_published,cover_image";
 103                 String authorContent = "fields[author]=name";
 104                 String chapterContent = "fields[chapter]=chapter_number,title,content_html,authors_note_html";
 105                 String includes = "author,chapters,tags";
 106
 107                 String urlString = String.format(
 108                                 "https://www.fimfiction.net/api/v2/stories/%s?" //
 109                                                 + "%s&%s&%s&" //
 110                                                 + "include=%s", //
 111                                 storyId, //
 112                                 storyContent, authorContent, chapterContent,//
 113                                 includes);
 114
 115                 // URL params must be URL-encoded: "[ ]" <-> "%5B %5D"
 116                 urlString = urlString.replace("[", "%5B").replace("]", "%5D");
 117
 118                 URL url = new URL(urlString);
 119                 InputStream jsonIn = Instance.getCache().open(url, this, false);
 120                 try {
 121                         return IOUtils.readSmallStream(jsonIn);
 122                 } finally {
 123                         jsonIn.close();
 124                 }
 125         }
 126
 127         @Override
 128         protected MetaData getMeta() throws IOException {
 129                 MetaData meta = new MetaData();
 130
 131                 meta.setTitle(getKeyJson(json, 0, "type", "story", "title"));
 132                 meta.setAuthor(getKeyJson(json, 0, "type", "user", "name"));
 133                 meta.setDate(getKeyJson(json, 0, "type", "story", "date_published"));
 134                 meta.setTags(getTags());
 135                 meta.setSource(getType().getSourceName());
 136                 meta.setUrl(getSource().toString());
 137                 meta.setPublisher(getType().getSourceName());
 138                 meta.setUuid(getSource().toString());
 139                 meta.setLuid("");
 140                 meta.setLang("en");
 141                 meta.setSubject("MLP");
 142                 meta.setType(getType().toString());
 143                 meta.setImageDocument(false);
 144
 145                 String coverImageLink = getKeyJson(json, 0, "type", "story",
 146                                 "cover_image", "full");
 147                 if (!coverImageLink.trim().isEmpty()) {
 148                         URL coverImageUrl = new URL(coverImageLink.trim());
 149
 150                         // No need to use the oauth, cookies... for the cover
 151                         // Plus: it crashes on Android because of the referer
 152                         try {
 153                                 InputStream in = Instance.getCache().open(coverImageUrl, null,
 154                                                 true);
 155                                 try {
 156                                         meta.setCover(new Image(in));
 157                                 } finally {
 158                                         in.close();
 159                                 }
 160                         } catch (IOException e) {
 161                                 Instance.getTraceHandler().error(
 162                                                 new IOException(
 163                                                                 "Cannot get the story cover, ignoring...", e));
 164                         }
 165                 }
 166
 167                 return meta;
 168         }
 169
 170         private List<String> getTags() {
 171                 List<String> tags = new ArrayList<String>();
 172                 tags.add("MLP");
 173
 174                 int pos = 0;
 175                 while (pos >= 0) {
 176                         pos = indexOfJsonAfter(json, pos, "type", "story_tag");
 177                         if (pos >= 0) {
 178                                 tags.add(getKeyJson(json, pos, "name").trim());
 179                         }
 180                 }
 181
 182                 return tags;
 183         }
 184
 185         @Override
 186         protected String getDesc() {
 187                 String desc = getKeyJson(json, 0, "type", "story", "description");
 188                 return unbbcode(desc);
 189         }
 190
 191         @Override
 192         protected List<Entry<String, URL>> getChapters(Progress pg) {
 193                 chapterNames = new TreeMap<Integer, String>();
 194                 chapterContents = new TreeMap<Integer, String>();
 195
 196                 int pos = 0;
 197                 while (pos >= 0) {
 198                         pos = indexOfJsonAfter(json, pos, "type", "chapter");
 199                         if (pos >= 0) {
 200                                 int posNumber = indexOfJsonAfter(json, pos, "chapter_number");
 201                                 int posComa = json.indexOf(",", posNumber);
 202                                 final int number = Integer.parseInt(json.substring(posNumber,
 203                                                 posComa).trim());
 204                                 final String title = getKeyJson(json, pos, "title");
 205                                 String notes = getKeyJson(json, pos, "authors_note_html");
 206                                 String content = getKeyJson(json, pos, "content_html");
 207
 208                                 if (!notes.trim().isEmpty()) {
 209                                         notes = "<br/>* * *<br/>" + notes;
 210                                 }
 211
 212                                 chapterNames.put(number, title);
 213                                 chapterContents.put(number, content + notes);
 214                         }
 215                 }
 216
 217                 List<Entry<String, URL>> urls = new ArrayList<Entry<String, URL>>();
 218                 for (String title : chapterNames.values()) {
 219                         urls.add(new AbstractMap.SimpleEntry<String, URL>(title, null));
 220                 }
 221
 222                 return urls;
 223         }
 224
 225         @Override
 226         protected String getChapterContent(URL source, int number, Progress pg) {
 227                 return chapterContents.get(number);
 228         }
 229
 230         @Override
 231         protected boolean supports(URL url) {
 232                 return "fimfiction.net".equals(url.getHost())
 233                                 || "www.fimfiction.net".equals(url.getHost());
 234         }
 235
 236         /**
 237          * Generate a new token from the client ID and secret.
 238          * <p>
 239          * Note that those tokens are long-lived, and it would be badly seen to
 240          * create a lot of them without due cause.
 241          * <p>
 242          * So, please cache and re-use them.
 243          *
 244          * @param clientId
 245          *            the client ID offered on FimFiction
 246          * @param clientSecret
 247          *            the client secret that goes with it
 248          *
 249          * @return a new generated token linked to that client ID
 250          *
 251          * @throws IOException
 252          *             in case of I/O errors
 253          */
 254         static private String generateOAuth(String clientId, String clientSecret)
 255                         throws IOException {
 256                 URL url = new URL("https://www.fimfiction.net/api/v2/token");
 257                 Map<String, String> params = new HashMap<String, String>();
 258                 params.put("client_id", clientId);
 259                 params.put("client_secret", clientSecret);
 260                 params.put("grant_type", "client_credentials");
 261                 InputStream in = Instance.getCache().openNoCache(url, null, params,
 262                                 null, null);
 263
 264                 String jsonToken = IOUtils.readSmallStream(in);
 265                 in.close();
 266
 267                 // Extract token type and token from: {
 268                 // token_type = "Bearer",
 269                 // access_token = "xxxxxxxxxxxxxx"
 270                 // }
 271
 272                 String tokenType = getKeyText(jsonToken, "\"token_type\"", "\"", "\"");
 273                 String token = getKeyText(jsonToken, "\"access_token\"", "\"", "\"");
 274
 275                 return tokenType + " " + token;
 276         }
 277
 278         // afters: [name, value] pairs (or "" for any of them), can end without
 279         // value
 280         static private int indexOfJsonAfter(String json, int startAt,
 281                         String... afterKeys) {
 282                 ArrayList<String> afters = new ArrayList<String>();
 283                 boolean name = true;
 284                 for (String key : afterKeys) {
 285                         if (key != null && !key.isEmpty()) {
 286                                 afters.add("\"" + key + "\"");
 287                         } else {
 288                                 afters.add("\"");
 289                                 afters.add("\"");
 290                         }
 291
 292                         if (name) {
 293                                 afters.add(":");
 294                         }
 295
 296                         name = !name;
 297                 }
 298
 299                 return indexOfAfter(json, startAt, afters.toArray(new String[] {}));
 300         }
 301
 302         // afters: [name, value] pairs (or "" for any of them), can end without
 303         // value but will then be empty, not NULL
 304         static private String getKeyJson(String json, int startAt,
 305                         String... afterKeys) {
 306                 int pos = indexOfJsonAfter(json, startAt, afterKeys);
 307                 if (pos < 0) {
 308                         return "";
 309                 }
 310
 311                 String result = "";
 312                 String wip = json.substring(pos);
 313
 314                 pos = nextUnescapedQuote(wip, 0);
 315                 if (pos >= 0) {
 316                         wip = wip.substring(pos + 1);
 317                         pos = nextUnescapedQuote(wip, 0);
 318                         if (pos >= 0) {
 319                                 result = wip.substring(0, pos);
 320                         }
 321                 }
 322
 323                 result = result.replace("\\t", "\t").replace("\\\"", "\"");
 324
 325                 return result;
 326         }
 327
 328         // next " but don't take \" into account
 329         static private int nextUnescapedQuote(String result, int pos) {
 330                 while (pos >= 0) {
 331                         pos = result.indexOf("\"", pos);
 332                         if (pos == 0 || (pos > 0 && result.charAt(pos - 1) != '\\')) {
 333                                 break;
 334                         }
 335
 336                         if (pos < result.length()) {
 337                                 pos++;
 338                         }
 339                 }
 340
 341                 return pos;
 342         }
 343
 344         // quick & dirty filter
 345         static private String unbbcode(String bbcode) {
 346                 String text = bbcode.replace("\\r\\n", "<br/>") //
 347                                 .replace("[i]", "_").replace("[/i]", "_") //
 348                                 .replace("[b]", "*").replace("[/b]", "*") //
 349                                 .replaceAll("\\[[^\\]]*\\]", "");
 350                 return text;
 351         }
 352
 353         /**
 354          * Return the text between the key and the endKey (and optional subKey can
 355          * be passed, in this case we will look for the key first, then take the
 356          * text between the subKey and the endKey).
 357          *
 358          * @param in
 359          *            the input
 360          * @param key
 361          *            the key to match (also supports "^" at start to say
 362          *            "only if it starts with" the key)
 363          * @param subKey
 364          *            the sub key or NULL if none
 365          * @param endKey
 366          *            the end key or NULL for "up to the end"
 367          * @return the text or NULL if not found
 368          */
 369         static private String getKeyText(String in, String key, String subKey,
 370                         String endKey) {
 371                 String result = null;
 372
 373                 String line = in;
 374                 if (line != null && line.contains(key)) {
 375                         line = line.substring(line.indexOf(key) + key.length());
 376                         if (subKey == null || subKey.isEmpty() || line.contains(subKey)) {
 377                                 if (subKey != null) {
 378                                         line = line.substring(line.indexOf(subKey)
 379                                                         + subKey.length());
 380                                 }
 381                                 if (endKey == null || line.contains(endKey)) {
 382                                         if (endKey != null) {
 383                                                 line = line.substring(0, line.indexOf(endKey));
 384                                                 result = line;
 385                                         }
 386                                 }
 387                         }
 388                 }
 389
 390                 return result;
 391         }
 392
 393         /**
 394          * Return the first index after all the given "afters" have been found in
 395          * the {@link String}, or -1 if it was not possible.
 396          *
 397          * @param in
 398          *            the input
 399          * @param startAt
 400          *            start at this position in the string
 401          * @param afters
 402          *            the sub-keys to find before checking for key/endKey
 403          *
 404          * @return the text or NULL if not found
 405          */
 406         static private int indexOfAfter(String in, int startAt, String... afters) {
 407                 int pos = -1;
 408                 if (in != null && !in.isEmpty()) {
 409                         pos = startAt;
 410                         if (afters != null) {
 411                                 for (int i = 0; pos >= 0 && i < afters.length; i++) {
 412                                         String subKey = afters[i];
 413                                         if (!subKey.isEmpty()) {
 414                                                 pos = in.indexOf(subKey, pos);
 415                                                 if (pos >= 0) {
 416                                                         pos += subKey.length();
 417                                                 }
 418                                         }
 419                                 }
 420                         }
 421                 }
 422
 423                 return pos;
 424         }
 425 }