xamxam/docs/file-uploads.md

File Uploads

Reference for all file upload handling in XAMXAM: accepted types, size limits, storage layout, display behaviour, and ordering.

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Upload surfaces

There are three forms where files can be uploaded:

Surface	Path	Who uses it
Admin — add thesis	/admin/add.php	Administrator
Admin — edit thesis	/admin/edit.php?id=N	Administrator
Student submission	/partage/<slug>	Student via share link

All three surfaces share the same backend controller logic (ThesisCreateController / ThesisEditController) and the same validation rules.

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File categories

Each uploaded file is assigned a file_type that controls how it is displayed on the public TFE page.

file_type	How displayed	Trigger
main	Inline <iframe> with download fallback	.pdf extension
image	<img>	image/* MIME or image extension
video	<video controls> with Range support	video/* MIME or video extension
audio	<audio controls> with Range support	audio/* MIME or audio extension
caption	Not displayed — paired with preceding video	.vtt extension
cover	Cover thumbnail (not shown in file loop)	Separate couverture input
other	Download link only, never rendered	Everything else

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Accepted file types

TFE content files (files[] input)

Documents

Extension	MIME type	Display
.pdf	application/pdf	Inline iframe

Images

Extension	MIME type	Display
.jpg / .jpeg	image/jpeg	<img>
.png	image/png	<img>
.gif	image/gif	<img>
.webp	image/webp	<img>

Video

Extension	MIME type	Display
.mp4	video/mp4	<video>
.webm	video/webm	<video>
.mov	video/quicktime	<video> (served as video/mp4)
.ogv	video/ogg	<video>

Audio

Extension	MIME type	Display
.mp3	audio/mpeg	<audio>
.ogg / .oga	audio/ogg	<audio>
.wav	audio/wav	<audio>
.flac	audio/flac	<audio>
.aac	audio/aac	<audio>
.m4a	audio/mp4	<audio>

Captions (WebVTT)

Extension	MIME type	Behaviour
.vtt	text/vtt	Silently paired with the preceding <video>. The N-th .vtt file is attached to the N-th video in display order. Not shown as a standalone item.

Archives and other downloadable files

Extension	MIME type	Display
.zip	application/zip	Download link
.tar	application/x-tar	Download link
.gz / .tgz	application/gzip	Download link
Any other extension	application/octet-stream	Download link

Files whose MIME type is application/octet-stream are accepted only if their extension is in the known list above. Unknown extensions with an unknown MIME type are rejected.

Cover image (couverture input)

Extension	MIME type
.jpg / .jpeg	image/jpeg
.png	image/png

Max size: 20 MB.

Banner image (banner input)

Extension	MIME type
.jpg / .jpeg	image/jpeg
.png	image/png
.webp	image/webp

Landscape format recommended (4:1 ratio). Max size: 20 MB.

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Size limits

Limit	Value
Per-file limit (TFE content files)	500 MB
PHP upload_max_filesize	512 MB
PHP post_max_size	520 MB
Cover image	20 MB
Banner image	20 MB

The PHP limits are set in app/public/.htaccess (Apache) and app/public/.user.ini (PHP-FPM / nginx). For environments that require higher limits, edit those two files.

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File ordering

Files are displayed on the public TFE page in sort_order sequence (ascending). The sort_order column is stored in thesis_files.

Setting order on upload (add / partage forms)

The file queue in the upload form is drag-sortable via SortableJS. Drag rows into the desired display order before submitting. The order is submitted as file_orders[] hidden fields and stored on insert.

Changing order after upload (edit form)

The existing-files list on the edit form is also drag-sortable. Drag rows into the desired order and save — the new order is submitted as file_sort_order[] (an array of file IDs in the desired sequence) and persisted via Database::reorderThesisFiles().

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Per-file labels

Each TFE content file can have an optional display label (a short caption or description). This is shown as a <figcaption> beneath the file on the public page.

• On the upload queue: type in the label field below each filename before submitting.
• On the edit form: the label input is shown inline in each file row; edited labels are saved alongside the sort order.

Labels are stored in thesis_files.display_label. If blank, the field falls back to the legacy description column.

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Storage layout

Files are stored outside the webroot in app/storage/.

app/storage/
├── covers/
│   └── <random-hex>.jpg          # cover images
├── banners/
│   └── <random-hex>.jpg          # home-page banners
└── theses/
    └── <year>/
        └── <YEAR>_<AUTHOR_SLUG>/
            └── <AUTHOR_SLUG>_<sanitized-filename>.<ext>

• Author slug: uppercase ASCII, spaces → underscores, accents stripped (e.g. EMMA_RENARD).
• Filename: same normalisation applied to the original filename.
• If a folder <YEAR>_<AUTHOR_SLUG> already exists a numeric suffix is appended (_1, _2, …).
• If a filename already exists in the folder a numeric suffix is appended before the extension.

Files are never served directly from disk. All access goes through MediaController (/media?path=…), which enforces:

• Path traversal prevention (character whitelist + realpath() jail)
• Visibility gate: access_type_id = 3 (Interdit) → HTTP 403
• MIME allow-list check before serving

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Security notes

• MIME type is verified via finfo (magic bytes), not the browser-supplied Content-Type.
• Extension is additionally checked against the allow-list as a second gate.
• Filenames are sanitised (accents stripped, non-alphanumeric → _) before writing to disk; the original name is stored in thesis_files.file_name for display.
• Cover and banner images are stored under a random 32-hex-char name, completely decoupled from the original filename.
• Uploaded files are chmod 0644 after move.
• HTTP Range requests are supported for audio and video so the browser can seek without downloading the entire file.

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Database schema reference

CREATE TABLE thesis_files (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    thesis_id     INTEGER NOT NULL,
    file_type     TEXT NOT NULL,     -- 'main'|'image'|'video'|'audio'|'caption'|'cover'|'other'
    file_path     TEXT NOT NULL,     -- path relative to STORAGE_ROOT
    file_name     TEXT NOT NULL,     -- original filename (display only)
    file_size     INTEGER,           -- bytes
    mime_type     TEXT,
    description   TEXT,              -- legacy caption field
    display_label TEXT,              -- per-file caption (migration 007)
    sort_order    INTEGER NOT NULL DEFAULT 0,  -- display order (migration 007)
    uploaded_at   DATETIME DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (thesis_id) REFERENCES theses(id) ON DELETE CASCADE
);

Files are queried ordered by sort_order ASC, uploaded_at ASC.

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Relevant source files

File	Role
app/src/Controllers/ThesisCreateController.php	Upload validation + storage on create
app/src/Controllers/ThesisEditController.php	Upload validation + storage on edit; reorder + label save
app/src/Controllers/MediaController.php	Secure file serving with Range support
app/src/Database.php	insertThesisFile, reorderThesisFiles, updateThesisFileLabel, getThesisFiles
app/templates/partials/form/fieldset-files.php	Upload UI partial (add / partage forms)
app/templates/admin/edit.php	Edit-form files section (sortable existing files + new upload queue)
app/templates/public/tfe.php	Public rendering of all file types
app/public/assets/js/file-upload-queue.js	SortableJS-backed upload queue + legacy preview
app/public/.htaccess	PHP upload limits (Apache)
app/public/.user.ini	PHP upload limits (PHP-FPM / nginx)
app/migrations/applied/007_thesis_files_sort_and_label.sql	DB migration adding sort_order + display_label