| 1 | package be.nikiroo.gofetch; |
| 2 | |
| 3 | import java.io.File; |
| 4 | import java.io.FileWriter; |
| 5 | import java.io.FilenameFilter; |
| 6 | import java.io.IOException; |
| 7 | import java.util.ArrayList; |
| 8 | import java.util.Arrays; |
| 9 | import java.util.Collections; |
| 10 | import java.util.List; |
| 11 | |
| 12 | import be.nikiroo.gofetch.data.Story; |
| 13 | import be.nikiroo.gofetch.output.Gopher; |
| 14 | import be.nikiroo.gofetch.output.Html; |
| 15 | import be.nikiroo.gofetch.output.Output; |
| 16 | import be.nikiroo.gofetch.support.BasicSupport; |
| 17 | import be.nikiroo.gofetch.support.BasicSupport.Type; |
| 18 | import be.nikiroo.utils.IOUtils; |
| 19 | |
| 20 | /** |
| 21 | * The class that will manage the fetch operations. |
| 22 | * <p> |
| 23 | * It will scrap the required websites and process them to disk. |
| 24 | * |
| 25 | * @author niki |
| 26 | */ |
| 27 | public class Fetcher { |
| 28 | private File dir; |
| 29 | private String preselector; |
| 30 | private int maxStories; |
| 31 | private String hostname; |
| 32 | private int port; |
| 33 | private Type type; |
| 34 | |
| 35 | /** |
| 36 | * Prepare a new {@link Fetcher}. |
| 37 | * |
| 38 | * @param dir |
| 39 | * the target directory where to save the files (won't have |
| 40 | * impact on the files' content) |
| 41 | * @param preselector |
| 42 | * the sub directory and (pre-)selector to use for the resources |
| 43 | * (<b>will</b> have an impact on the files' content) |
| 44 | * @param type |
| 45 | * the type of news to get (or the special keyword ALL to get all |
| 46 | * of the supported sources) |
| 47 | * @param maxStories |
| 48 | * the maximum number of stories to show on the resume page |
| 49 | * @param hostname |
| 50 | * the gopher host to use (<b>will</b> have an impact on the |
| 51 | * files' content) |
| 52 | * @param port |
| 53 | * the gopher port to use (<b>will</b> have an impact on the |
| 54 | * files' content) |
| 55 | */ |
| 56 | public Fetcher(File dir, String preselector, Type type, int maxStories, |
| 57 | String hostname, int port) { |
| 58 | this.dir = dir; |
| 59 | this.preselector = preselector; |
| 60 | this.type = type; |
| 61 | this.maxStories = maxStories; |
| 62 | this.hostname = hostname; |
| 63 | this.port = port; |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Start the fetching operation. |
| 68 | * <p> |
| 69 | * This method will handle the main pages itself, and will call |
| 70 | * {@link Fetcher#list(BasicSupport)} for the stories. |
| 71 | * |
| 72 | * @throws IOException |
| 73 | * in case of I/O error |
| 74 | */ |
| 75 | public void start() throws IOException { |
| 76 | StringBuilder gopherBuilder = new StringBuilder(); |
| 77 | StringBuilder htmlBuilder = new StringBuilder(); |
| 78 | |
| 79 | BasicSupport.setPreselector(preselector); |
| 80 | for (Type type : Type.values()) { |
| 81 | BasicSupport support = BasicSupport.getSupport(type); |
| 82 | |
| 83 | if (type == this.type || this.type == null) { |
| 84 | list(support); |
| 85 | } |
| 86 | |
| 87 | gopherBuilder.append(getLink(support.getDescription(), |
| 88 | support.getSelector(), true, false)); |
| 89 | |
| 90 | String ref = support.getSelector(); |
| 91 | while (ref.startsWith("/")) { |
| 92 | ref = ref.substring(1); |
| 93 | } |
| 94 | ref = "../" + ref + "/index.html"; |
| 95 | |
| 96 | htmlBuilder.append(getLink(support.getDescription(), ref, false, |
| 97 | true)); |
| 98 | } |
| 99 | |
| 100 | File gopherCache = new File(dir, preselector); |
| 101 | gopherCache.mkdirs(); |
| 102 | File htmlIndex = new File(gopherCache, "index.html"); |
| 103 | gopherCache = new File(gopherCache, ".cache"); |
| 104 | |
| 105 | Output gopher = new Gopher(null, hostname, preselector, port); |
| 106 | Output html = new Html(null, hostname, preselector, port); |
| 107 | |
| 108 | FileWriter writer = new FileWriter(gopherCache); |
| 109 | try { |
| 110 | writer.append(gopher.getIndexHeader()); |
| 111 | writer.append(gopherBuilder.toString()); |
| 112 | writer.append(gopher.getIndexFooter()); |
| 113 | } finally { |
| 114 | writer.close(); |
| 115 | } |
| 116 | |
| 117 | try { |
| 118 | writer = new FileWriter(htmlIndex); |
| 119 | writer.append(html.getIndexHeader()); |
| 120 | writer.append(htmlBuilder.toString()); |
| 121 | writer.append(html.getIndexFooter()); |
| 122 | } finally { |
| 123 | writer.close(); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Process the stories for the given {@link BasicSupport} to disk. |
| 129 | * |
| 130 | * @param support |
| 131 | * the {@link BasicSupport} to download from |
| 132 | * |
| 133 | * @throws IOException |
| 134 | * in case of I/O error |
| 135 | **/ |
| 136 | private void list(BasicSupport support) throws IOException { |
| 137 | // Get stories: |
| 138 | System.err |
| 139 | .print("Listing recent news for " + support.getType() + "..."); |
| 140 | List<Story> stories = support.list(); |
| 141 | System.err.println(" " + stories.size() + " stories found!"); |
| 142 | |
| 143 | // Get comments (and update stories if needed): |
| 144 | int i = 1; |
| 145 | for (Story story : stories) { |
| 146 | System.err.println(String.format("%02d/%02d", i, stories.size()) |
| 147 | + " Fetching full story " + story.getId() + "..."); |
| 148 | support.fetch(story); |
| 149 | i++; |
| 150 | } |
| 151 | |
| 152 | Output gopher = new Gopher(support.getType(), hostname, preselector, |
| 153 | port); |
| 154 | Output html = new Html(support.getType(), hostname, preselector, port); |
| 155 | |
| 156 | new File(dir, support.getSelector()).mkdirs(); |
| 157 | |
| 158 | for (Story story : stories) { |
| 159 | IOUtils.writeSmallFile(dir, story.getSelector() + ".header", |
| 160 | gopher.exportHeader(story)); |
| 161 | IOUtils.writeSmallFile(dir, story.getSelector() + ".header.html", |
| 162 | html.exportHeader(story)); |
| 163 | |
| 164 | IOUtils.writeSmallFile(dir, story.getSelector(), |
| 165 | gopher.export(story)); |
| 166 | IOUtils.writeSmallFile(dir, story.getSelector() + ".html", |
| 167 | html.export(story)); |
| 168 | } |
| 169 | |
| 170 | // Finding headers of all stories in cache: |
| 171 | File varDir = new File(dir, support.getSelector()); |
| 172 | String[] headers = varDir.list(new FilenameFilter() { |
| 173 | @Override |
| 174 | public boolean accept(File dir, String name) { |
| 175 | return name.endsWith(".header"); |
| 176 | } |
| 177 | }); |
| 178 | |
| 179 | // Reverse sort: |
| 180 | Arrays.sort(headers); |
| 181 | List<String> tmp = Arrays.asList(headers); |
| 182 | Collections.reverse(tmp); |
| 183 | headers = tmp.toArray(new String[] {}); |
| 184 | // |
| 185 | |
| 186 | // Write the index (with "MORE" links if needed) |
| 187 | int page = 0; |
| 188 | List<String> gopherLines = new ArrayList<String>(); |
| 189 | List<String> htmlLines = new ArrayList<String>(); |
| 190 | for (i = 0; i < headers.length; i++) { |
| 191 | gopherLines |
| 192 | .add(IOUtils.readSmallFile(new File(varDir, headers[i]))); |
| 193 | htmlLines.add(IOUtils.readSmallFile(new File(varDir, headers[i] |
| 194 | + ".html"))); |
| 195 | |
| 196 | boolean enoughStories = (i > 0 && i % maxStories == 0); |
| 197 | boolean last = i == headers.length - 1; |
| 198 | if (enoughStories || last) { |
| 199 | if (!last) { |
| 200 | gopherLines.add(getLink("More", support.getSelector() |
| 201 | + ".cache_" + (page + 1), false, false)); |
| 202 | htmlLines.add(getLink("More", "index_" + (page + 1) |
| 203 | + ".html", false, true)); |
| 204 | } |
| 205 | |
| 206 | write(gopherLines, varDir, ".cache", "", page); |
| 207 | write(htmlLines, varDir, "index", ".html", page); |
| 208 | gopherLines = new ArrayList<String>(); |
| 209 | htmlLines = new ArrayList<String>(); |
| 210 | page++; |
| 211 | } |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | private void write(List<String> lines, File varDir, String basename, |
| 216 | String ext, int page) throws IOException { |
| 217 | File file = new File(varDir, basename + (page > 0 ? "_" + page : "") |
| 218 | + ext); |
| 219 | |
| 220 | FileWriter writer = new FileWriter(file); |
| 221 | try { |
| 222 | for (String line : lines) { |
| 223 | writer.append(line).append("\r\n"); |
| 224 | } |
| 225 | } finally { |
| 226 | writer.close(); |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | private String getLink(String name, String ref, boolean index, boolean html) { |
| 231 | if (!html) { |
| 232 | return new StringBuilder().append((index ? "0" : "1") + name) |
| 233 | .append("\t").append("1" + ref) // |
| 234 | .append("\t").append(hostname) // |
| 235 | .append("\t").append(Integer.toString(port)) // |
| 236 | .append("\r\n").toString(); |
| 237 | } |
| 238 | |
| 239 | return new StringBuilder().append( |
| 240 | "<div class='site'><a href='" + ref + "'>" + name |
| 241 | + "</a></div>\n").toString(); |
| 242 | } |
| 243 | } |