Bandcamp images work with image IDs, which provide different resolutions.
Images on Bandcamp are not always squares, and some IDs respect aspect ratios
where some others not.
The extractor will only use the ones which preserve aspect ratio and will not
provide original images, for performance and size purposes.
Because of this aspect ratio preservation constraint, only one dimension will
be known at a time.
The image IDs with their respective dimension used are:
- 10: 1200w;
- 101: 90h;
- 170: 422h;
- 171: 646h;
- 20: 1024w;
- 200: 420h;
- 201: 280h;
- 202: 140h;
- 204: 360h;
- 205: 240h;
- 206: 180h;
- 207: 120h;
- 43: 100h;
- 44: 200h.
(Where w represents the width of the image and h the height of the image)
Note that these dimensions are theoretical because if the image size is less
than the dimensions of the image ID, it will be not upscaled but kept to its
original size.
All these resolutions are stored in a private static list of ThumbnailSuffixes
in BandcampExtractorHelper, in which the methods to get mutliple images have
been added:
- getImagesFromImageUrl(String): public method to get images from an image URL;
- getImagesFromImageId(long, boolean): public method to get images from an
image ID;
- getImagesFromImageBaseUrl(String): private utility method to get images from
the static list of ThumbnailSuffixes from a given image base URL, containing
the path to the image, a "a" letter if it comes from an album, its ID and an
underscore.
Some existing methods have been also edited:
- the documentation of getImageUrl(long, boolean) has been changed to reflect
the Bandcamp images findings;
- getThumbnailUrlFromSearchResult has been renamed to
getImagesFromSearchResult, and a documentation has been added to this method.
The method replaceHttpWithHttps of the Utils class has been also used in
BandcampExtractorHelper instead of doing manually what the method does.
This header was not sent before and was added and guessed by OkHttp. This can create issues when using other HTTP clients than OkHttp, such as Cronet.
Also make use of StandardCharsets.UTF_8 when getting bytes of bodies instead of the platform default's charset, to make sure to prevent some encoding issues on some JVMs.
* Test for bandcamp footer instead of meta tag (which is not present on
all pages)
* Accept links to /music, not just /releases
* Correctly handle uppercase URLs
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