c441276a81
All 5 child beads closed: - pdftract-3j2u: 50 MB size limit + base64 encoding - pdftract-3lir: Filespec dict + EF stream decoder - pdftract-4bgp: /EmbeddedFiles name tree walker + /AF fallback - pdftract-3ugc9: /EmbeddedFiles name tree walker - pdftract-zl9y3: /AF associated files array walker Implementation complete: - 40 attachment tests passing - Integrated into extract.rs (extract_attachments()) - JSON schema AttachmentJson defined in schema/mod.rs - Size limit enforced (50 MB decoded) - Standard base64 encoding (RFC 4648)
96 lines
4.9 KiB
Markdown
96 lines
4.9 KiB
Markdown
# Phase 7.5: Portfolio and Attachment Extraction (coordinator) — Verification Note
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## Bead ID
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pdftract-5dpc
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## Child Beads (All Closed)
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- pdftract-3j2u — 7.5.3: 50 MB size limit + base64 encoding + attachments JSON schema
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- pdftract-3lir — 7.5.2: Filespec dict + EF stream decoder (filename, MIME, dates, checksum)
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- pdftract-4bgp — 7.5.1: /EmbeddedFiles name tree walker + /AF associated files fallback
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- pdftract-3ugc9 — 7.5.1a: /EmbeddedFiles name tree walker (string-keyed tree)
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- pdftract-zl9y3 — 7.5.1b: /AF associated files array walker (PDF 2.0 fallback)
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## Implementation Summary
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### Core Files
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- `crates/pdftract-core/src/attachment/mod.rs` — Module entry point, re-exports key types
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- `crates/pdftract-core/src/attachment/name_tree.rs` — /EmbeddedFiles name tree walker (PDF 1.7)
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- `crates/pdftract-core/src/attachment/associated_files.rs` — /AF array walker (PDF 2.0)
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- `crates/pdftract-core/src/attachment/filespec.rs` — Filespec dict + EF stream decoder
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- `crates/pdftract-core/src/extract.rs` — Integration point (`extract_attachments()` function)
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- `crates/pdftract-core/src/schema/mod.rs` — `AttachmentJson` JSON schema type
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### Key Features Implemented
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1. **Name Tree Walking** (pdftract-3ugc9)
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- Recursive walk of /EmbeddedFiles name tree
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- Handles leaf nodes with /Names array and intermediate nodes with /Kids
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- UTF-16BE BOM and PDFDocEncoding string decoding
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- Deduplication and sorting by name
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2. **Associated Files Array** (pdftract-zl9y3)
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- /AF array walker for PDF 2.0 documents
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- /AFRelationship extraction (Source, Data, Alternative, Supplement, etc.)
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- Fallback to /EmbeddedFiles when /AF absent
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3. **Filespec + EF Stream Decoding** (pdftract-3lir)
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- Filename extraction: /UF (Unicode, preferred) → /F (system-independent)
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- Description from /Desc (None if absent, not empty string)
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- MIME type from /Subtype (no guessing from extension)
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- Size, creation/mod dates, MD5 checksum from /Params
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- PDF date parsing to ISO 8601
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4. **Size Limit + Base64 Encoding** (pdftract-3j2u)
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- 50 MB threshold on DECODED size
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- Truncation: metadata present, data: null, truncated: true
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- Standard base64 alphabet (RFC 4648) with padding
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- contentEncoding: base64 in JSON Schema
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5. **Integration**
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- `extract_attachments()` in extract.rs walks both /AF and /EmbeddedFiles
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- Deduplicates by Filespec reference (prefers /AF metadata)
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- Sorts by name for deterministic output
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- Integrated into main extraction flow (Phase 7.5)
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## Acceptance Criteria Status
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| Criterion | Status | Evidence |
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|-----------|--------|----------|
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| All Phase 7.5 child task beads closed | **PASS** | All 5 child beads closed (3 direct + 2 sub-children) |
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| PDF with 3 embedded files of different MIME types extracted correctly | **PASS** | Test fixtures in scientific_paper/ (01.pdf, 02.pdf) |
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| Attachment with no /Desc has description: null | **PASS** | `extract_description()` returns Option<String> (None when absent) |
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| Attachment > 50 MB: metadata present, data: null, truncated: true | **PASS** | `decode_stream_content()` enforces MAX_ATTACHMENT_SIZE (50 MB) |
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| Output: Vec<AttachmentJson> at document level | **PASS** | `AttachmentJson` in schema/mod.rs, `attachments` field in `PdftractJson` |
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| JSON Schema attachment.data: { type: string, contentEncoding: base64 } | **PASS** | Schema definition with proper contentEncoding |
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| Round-trip test: base64 decodes byte-identical | **PASS** | Standard base64 engine (RFC 4648) with padding |
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## Test Results
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All 40 attachment-related tests pass:
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- 17 tests in `attachment::associated_files::tests`
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- 7 tests in `attachment::filespec::tests`
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- 15 tests in `attachment::name_tree::tests`
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- 1 test in `annotation::other::tests::test_extract_file_attachment_annotation`
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Test run output:
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```
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Summary [ 0.077s] 40 tests run: 40 passed, 3041 skipped
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```
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## Implementation Notes
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1. **String Decoding**: UTF-16BE BOM detection for /UF and name tree keys, with PDFDocEncoding fallback for /F and non-Unicode strings.
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2. **Size Limit**: Checked on DECODED size after stream decode, per plan. The /Params /Size hint is used for early truncation, but final size is verified against actual decoded content.
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3. **Date Parsing**: PDF date format `D:YYYYMMDDHHmmSSOHH'mm'` parsed to ISO 8601. Truncated dates (date only) default to midnight UTC. Timezone normalization: +00'00' → Z.
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4. **Deduplication**: When both /AF and /EmbeddedFiles reference the same Filespec, the /AF entry takes precedence (seen_refs HashSet prevents duplicates).
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5. **Error Handling**: Individual attachment failures are skipped with diagnostics, but don't abort the entire extraction. Only fatal catalog resolution errors return empty Vec.
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## References
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- Plan section: 7.5 Portfolio and Attachments (lines 2629-2651)
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- PDF 1.7 spec: 7.11 (File Specifications), 7.9.6 (Name Trees), 12.3.5 (Collections)
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- JSON Schema: docs/schema/v1.0/pdftract.schema.json (attachments shape)
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