There currently is no migration path from Drupal 7 to Drupal 8/9.
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Add migrate plugins to transfer Drupal 7 signature data from D7 to D8 and beyond.
Because Drupal 7 stores its signatures in Json data as well as a generated PNG image, it's not straight forward to make this transition.
The provided patch currently only works to migrate from Drupal 7 to Drupal 8 "Signature File" fields.
Because of this, this issue is dependent on the
Add ability to store the signature in a PNG file instead of Data URI in the database
✨
Add ability to store the signature in a PNG file instead of Data URI in the database
Fixed
issue.
Provide a means to migrate to normal D8 signature fields (which store values as Data URL blobs) and provide an ability to choose which one.
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Needs review
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Added update to \Plugin\migrate\process\SignatureFieldProcess::transform() which provides new logic to grab an existing file entity if one already exists for a given signature file URI.
This updated patch helps prevent situations where there could end up with multiple file entities for a given signature file.
This situation can occur when entity revisions which contain the reference to the signature file are migrated.