60 lines
1.9 KiB
Go
60 lines
1.9 KiB
Go
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package ap
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import (
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"encoding/json"
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"fmt"
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"net/url"
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"github.com/piprate/json-gold/ld"
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)
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type ApThing map[string]any
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type RemoteDocumentLoader struct{}
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// Try and parse a remote ActivityPub object into a more usable form
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// Result is a map[string]any where the keys defined in /ap/constants.go should be usable,
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// depending on the type of object
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// The general approach for fetching an object will be to fetch the main object
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// and only store the ID for sub-objects to fetch them later
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func ParseFromUrl(u *url.URL) (ApThing, error) {
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opts := ld.NewJsonLdOptions("")
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processor := ld.NewJsonLdProcessor()
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// TODO: Add custom document parser (copy default implementation) that includes verification
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// Explanation:
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// Expansion removes the context from a document (json-ld activitypub data)
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// and turns every field into something along the lines of
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// "https://example.com/ns#ObjectType": <Insert data for that object here>
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// This makes it easier to deal with things as they now have a very consistent naming scheme
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// See /ap/constants.go for those
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parsed, err := processor.Expand(u.String(), opts)
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if err != nil {
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return nil, fmt.Errorf("failed to process remote document: %w", err)
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}
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if len(parsed) == 0 {
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return nil, fmt.Errorf("document has a length of 0")
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}
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typed, ok := parsed[0].(ApThing)
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if !ok {
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return nil, fmt.Errorf("couldn't cast data to ApThing")
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}
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return typed, nil
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}
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// Compact an AP object down into a compressed json-ld form
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// That compacted form should be accepted by all AP servers
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// It also handles context for any fields
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// Content should only use keys defined in /ap/constants.go though
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// Other things might get lost in translation
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func Compact(content map[string]any) ([]byte, error) {
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opts := ld.NewJsonLdOptions("")
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processor := ld.NewJsonLdProcessor()
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res, err := processor.Compact(content, allContext, opts)
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if err != nil {
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return nil, fmt.Errorf("failed to compact data: %w", err)
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}
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return json.Marshal(res)
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}
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