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https://github.com/Jermolene/TiddlyWiki5
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326ae61929
* Fix encodebase64 and decodebase64 filters The documentation for encodebase64 says that the input is treated as binary data, but in fact the input is being treated as text data, with an extra UTF-8 encoding step being performed first. Likewise, the decodebase64 documentation says that it outputs binary data, but in fact it will do a UTF-8 decoding step before producing output, which will in fact garble binary data. This commit changes the behavior of encodebase64 and decodebase64 to match what the documentation says they do. It also adds an optional `text` suffix to both filters to keep the current behavior. Finally, an optional `urlsafe` suffix is added to both filters to allow them to use the "URL-safe" variant of base64 (using `-` instead of `+` and `_` instead of `/`). * Try to fix failing test Turns out a little more than this is going to be needed. * Fix binary base64 encoding, including unit tests * Update base64 filter documentation * Can't use replaceAll, too new Have to use String.replace with a global regex instead * Replace uses of window.btoa() in rest of code Since window.btoa() is not available under Node.js, we'll replace all uses of it with the $tw.utils.base64encode() function that now works correctly for binary data. * Add link to UTF-8 glossary definition at MDN
22 lines
1.6 KiB
Plaintext
22 lines
1.6 KiB
Plaintext
caption: encodebase64
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op-input: a [[selection of titles|Title Selection]]
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op-output: the input with base 64 encoding applied
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op-suffix: optional: `binary` to treat input as binary data, `urlsafe` for URL-safe output
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op-parameter:
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op-parameter-name:
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op-purpose: apply base 64 encoding to a string
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tags: [[Filter Operators]] [[String Operators]]
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title: encodebase64 Operator
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type: text/vnd.tiddlywiki
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from-version: 5.2.6
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See Mozilla Developer Network for details of [[base 64 encoding|https://developer.mozilla.org/en-US/docs/Glossary/Base64]]. TiddlyWiki uses [[library code from @nijikokun|https://gist.github.com/Nijikokun/5192472]] to handle the conversion.
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The input strings are interpreted as [[UTF-8 encoded|https://developer.mozilla.org/en-US/docs/Glossary/UTF-8]] text (or binary data instead if the `binary` suffix is present). The output strings are base64 encoded.
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The optional `binary` suffix, if present, causes the input string to be interpreted as binary data instead of text. Normally, an extra UTF-8 encoding step will be added before the base64 output is produced, so that emojis and other Unicode characters will be encoded correctly. If the input is binary data, such as an image, audio file, video, etc., then the UTF-8 encoding step would produce incorrect results, so using the `binary` suffix causes the UTF-8 encoding step to be skipped.
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The optional `urlsafe` suffix, if present, will use the alternate "URL-safe" base64 encoding, where `-` and `_` are used instead of `+` and `/` respectively, allowing the result to be used in URL query parameters or filenames.
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<<.operator-examples "encodebase64">>
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