Just a simple HTML web spider with no dependencies. It is possible to search for pages with a text on them or for the text itself, extract images, video, audio and save pages that satisfy the criteria along the way.
The flow of work fully depends on the configuration file. By default `conf.json` is used as a configuration file, but the name can be changed via `-conf` flag. The default configuration is embedded in the program so on the first launch or by simply deleting the file, a new `conf.json` will be created in the same directory as the executable itself unless the `-wDir` (working directory) flag is set to some other value. To see al available flags run `wecr -h`.
The configuration is split into different branches like `requests` (how requests are made, ie: request timeout, wait time, user agent), `logging` (use logs, output to a file), `save` (output file|directory, save pages or not) or `search` (use regexp, query string) each of which contain tweakable parameters. There are global ones as well such as `workers` (working threads that make requests in parallel) and `depth` (literally, how deep the recursive search should go). The names are simple and self-explanatory so no attribute-by-attribute explanation needed for most of them.
The parsing starts from `initial_pages` and goes deeper while ignoring the pages on domains that are in `blacklisted_domains` or are NOT in `allowed_domains`. If all initial pages are happen to be on blacklisted domains or are not in the allowed list - the program will get stuck. It is important to note that `*_domains` should be specified with an existing scheme (ie: https://en.wikipedia.org). Subdomains and ports **matter**: `https://unbewohnte.su:3000/` and `https://unbewohnte.su/` are **different**.
-`images` - find all images on pages and output to the corresponding directory in `output_dir` (**IMPORTANT**: set `content_fetch_timeout_ms` to `0` so the images (and other content below) load fully)
-`videos` - find and fetch files that look like videos
-`audio` - find and fetch files that look like audio
By default, if the query is not something of special values all the matches and other data will be outputted to `output.json` file as separate continuous JSON objects, but if `save_pages` is set to `true` and|or `query` is set to `images`, `videos`, `audio`, etc. - the additional contents will be put in the corresponding directories inside `output_dir`, which is neatly created by the executable's side.
The output almost certainly contains some duplicates and is not easy to work with programmatically, so you can use `-extractData` with the output JSON file argument (like `output.json`, which is the default output file name) to extract the actual data, filter out the duplicates and put each entry on its new line in a new text file.
