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< ol class = "chapter" > < li class = "chapter-item expanded affix " > < li class = "part-title" > Introduction< / li > < li class = "chapter-item expanded " > < a href = "welcome_and_overview.html" > Welcome and Overview< / a > < / li > < li class = "chapter-item expanded affix " > < li class = "part-title" > Setup< / li > < li class = "chapter-item expanded " > < a href = "setup/installation.html" > Installation< / a > < / li > < li class = "chapter-item expanded " > < a href = "postgres.html" > Using Postgres< / a > < / li > < li class = "chapter-item expanded " > < a href = "reverse_proxy.html" > Configuring a Reverse Proxy< / a > < / li > < li class = "chapter-item expanded " > < a href = "setup/forward_proxy.html" > Configuring a Forward/Outbound Proxy< / a > < / li > < li class = "chapter-item expanded " > < a href = "turn-howto.html" > Configuring a Turn Server< / a > < / li > < li class = "chapter-item expanded " > < a href = "delegate.html" > Delegation< / a > < / li > < li class = "chapter-item expanded affix " > < li class = "part-title" > Upgrading< / li > < li class = "chapter-item expanded " > < a href = "upgrade.html" > Upgrading between Synapse Versions< / a > < / li > < li class = "chapter-item expanded " > < a href = "MSC1711_certificates_FAQ.html" > Upgrading from pre-Synapse 1.0< / a > < / li > < li class = "chapter-item expanded affix " > < li class = "part-title" > Usage< / li > < li class = "chapter-item expanded " > < a href = "federate.html" > Federation< / a > < / li > < li class = "chapter-item expanded " > < a href = "usage/configuration/index.html" > Configuration< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "usage/configuration/homeserver_sample_config.html" > Homeserver Sample Config File< / a > < / li > < li class = "chapter-item expanded " > < a href = "usage/configuration/logging_sample_config.html" > Logging Sample Config File< / a > < / li > < li class = "chapter-item expanded " > < a href = "structured_logging.html" > Structured Logging< / a > < / li > < li class = "chapter-item expanded " > < a href = "templates.html" > Templates< / a > < / li > < li class = "chapter-item expanded " > < a href = "usage/configuration/user_authentication/index.html" > User Authentication< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "usage/configuration/user_authentication/single_sign_on/index.html" > Single-Sign On< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "openid.html" > OpenID Connect< / a > < / li > < li class = "chapter-item expanded " > < a href = "usage/configuration/user_authentication/single_sign_on/saml.html" > SAML< / a > < / li > < li class = "chapter-item expanded " > < a href = "usage/configuration/user_authentication/single_sign_on/cas.html" > CAS< / a > < / li > < li class = "chapter-item expanded " > < a href = "sso_mapping_providers.html" > SSO Mapping Providers< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "password_auth_providers.html" > Password Auth Providers< / a > < / li > < li class = "chapter-item expanded " > < a href = "jwt.html" > JSON Web Tokens< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "CAPTCHA_SETUP.html" > Registration Captcha< / a > < / li > < li class = "chapter-item expanded " > < a href = "application_services.html" > Application Services< / a > < / li > < li class = "chapter-item expanded " > < a href = "server_notices.html" > Server Notices< / a > < / li > < li class = "chapter-item expanded " > < a href = "consent_tracking.html" > Consent Tracking< / a > < / li > < li class = "chapter-item expanded " > < a href = "development/url_previews.html" > URL Previews< / a > < / li > < li class = "chapter-item expanded " > < a href = "user_directory.html" > User Directory< / a > < / li > < li class = "chapter-item expanded " > < a href = "message_retention_policies.html" > Message Retention Policies< / a > < / li > < li class = "chapter-item expanded " > < a href = "modules/index.html" > Pluggable Modules< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "modules/writing_a_module.html" > Writing a module< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "modules/spam_checker_callbacks.html" > Spam checker callbacks< / a > < / li > < li class = "chapter-item expanded " > < a href = "modules/third_party_rules_callbacks.html" > Third-party rules callbacks< / a > < / li > < li class = "chapter-item expanded " > < a href = "modules/presence_router_callbacks.html" > Presence router callbacks< / a > < / li > < li class = "chapter-item expanded " > < a href = "modu
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< h1 id = "media-repository" > < a class = "header" href = "#media-repository" > Media Repository< / a > < / h1 >
< p > < em > Synapse implementation-specific details for the media repository< / em > < / p >
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< p > The media repository is where attachments and avatar photos are stored.
It stores attachment content and thumbnails for media uploaded by local users.
It caches attachment content and thumbnails for media uploaded by remote users.< / p >
< h2 id = "storage" > < a class = "header" href = "#storage" > Storage< / a > < / h2 >
< p > Each item of media is assigned a < code > media_id< / code > when it is uploaded.
The < code > media_id< / code > is a randomly chosen, URL safe 24 character string.< / p >
< p > Metadata such as the MIME type, upload time and length are stored in the
sqlite3 database indexed by < code > media_id< / code > .< / p >
< p > Content is stored on the filesystem under a < code > " local_content" < / code > directory.< / p >
< p > Thumbnails are stored under a < code > " local_thumbnails" < / code > directory.< / p >
< p > The item with < code > media_id< / code > < code > " aabbccccccccdddddddddddd" < / code > is stored under
< code > " local_content/aa/bb/ccccccccdddddddddddd" < / code > . Its thumbnail with width
< code > 128< / code > and height < code > 96< / code > and type < code > " image/jpeg" < / code > is stored under
< code > " local_thumbnails/aa/bb/ccccccccdddddddddddd/128-96-image-jpeg" < / code > < / p >
< p > Remote content is cached under < code > " remote_content" < / code > directory. Each item of
remote content is assigned a local < code > " filesystem_id" < / code > to ensure that the
directory structure < code > " remote_content/server_name/aa/bb/ccccccccdddddddddddd" < / code >
is appropriate. Thumbnails for remote content are stored under
< code > " remote_thumbnail/server_name/..." < / code > < / p >
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