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233a51ad21
For Dataformats that support exporting HTML content, provide an API for converting images within that content to something suitable for the format. This fixes an issue with the PDF writer when it encountered a pluginfile.php image, which it tried to request via HTTP without an active session. This resulted in a 303 header returned by Moodle instead of the actual image, causing an exception in the underlying TCPDF library.
30 lines
1.5 KiB
Plaintext
30 lines
1.5 KiB
Plaintext
This files describes API changes in /dataformat/ download system,
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information provided here is intended especially for developers.
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=== 3.9 ===
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* The following methods have been added to the base dataformat class to allow instances to export to a local
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file. They can be overridden in extending classes to define how files should be created:
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- start_output_to_file()
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- close_output_to_file()
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* Calls to the following dataformat plugin methods have been removed:
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- write_header()
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- write_footer()
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* The following methods have been added to the base class to allow instances to define support for exporting
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HTML content, with additional support for defining how images should be embedded:
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- supports_html()
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- export_html_image_source()
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* Dataformat writers should also call the following method to ensure data is properly formatted before being
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written, which takes into account prior methods defining support for HTML:
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- format_record()
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=== 3.4 ===
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* In order to allow multiple sheets in an exported file the functions write_header() and write_footer() have
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been removed from core dataformat plugins and have been replaced.
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- write_header() has been replaced with the two functions start_output() and start_sheet().
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- write_footer() has been replaced with the two functions close_output() and close_sheet().
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For backwards compatibility write_header() and write_footer() will continue to work but if used will
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trigger the function error_log().
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=== 3.1 ===
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* Added new plugin system with low memory support for csv, ods, xls and json
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