Discard empty upload_name before persisting file #7905

Half-Shot · 2020-07-19T18:16:30Z

I noticed this when trying to upload something via a bridge, which caused the following error:

2020-07-19 19:04:07,670 - synapse.rest.media.v1.media_repository - 158 - INFO - POST-75 - Stored local media in file '/home/will/synapse/media_store/local_content/oo/QT/gQwsNbILJTMsHDNmvtbr'
2020-07-19 19:04:07,671 - synapse.http.server - 79 - ERROR - POST-75 - Failed handle request via 'UploadResource': <XForwardedForRequest at 0x7f2d54636e20 method='POST' uri='/_matrix/media/r0/upload?filename=' clientproto='HTTP/1.1' site=8008>
Traceback (most recent call last):
  File "/home/will/synapse/env/lib/python3.8/site-packages/synapse/http/server.py", line 228, in _async_render_wrapper
    callback_return = await self._async_render(request)
  File "/home/will/synapse/env/lib/python3.8/site-packages/synapse/http/server.py", line 254, in _async_render
    callback_return = await raw_callback_return
  File "/home/will/synapse/env/lib/python3.8/site-packages/synapse/rest/media/v1/upload_resource.py", line 77, in _async_render_POST
    content_uri = await self.media_repo.create_content(
  File "/home/will/synapse/env/lib/python3.8/site-packages/synapse/rest/media/v1/media_repository.py", line 160, in create_content
    await self.store.store_local_media(
....
  File "/home/will/synapse/env/lib/python3.8/site-packages/synapse/storage/engines/postgres.py", line 31, in _disable_bytes_adapter
    raise Exception("Passing bytes to DB is disabled.")
Exception: Passing bytes to DB is disabled.

While this doesn't cause a crash or any malicious behaviour, it's a touch annoying that the file was persisted to storage but the DB insertion failed because some parameters were not checked. This PR adds two simple checks to fail early if the parameters are the wrong type.

clokep · 2020-07-20T11:26:57Z

Looks like linting / mypy failed on this.

synapse/rest/media/v1/media_repository.py

clokep · 2020-07-20T17:41:44Z

I wonder if the additional checking should be doing in the rest code, not the handler?

Half-Shot · 2020-07-20T17:43:32Z

This was mostly written as a way to try and debug the error in the PR body. I don't really know why the rest layer didn't catch it, but it feels safer to me to catch it in the handler layer as well.

clokep · 2020-07-21T11:42:10Z

We talked about this briefly and the rest layer should be asserting the proper types are provided. Can you move those checks to UploadResource._async_render_POST? Thanks!

Although to be honest, looking at that code I don't see how bytes could have been passed through.

clokep

Per my preview comment.

richvdh · 2020-09-10T12:55:32Z

it looks like this has dropped off the radar somehow. That said, @Half-Shot could you fix the lint failures?

synapse/rest/media/v1/upload_resource.py

clokep · 2020-09-28T21:18:00Z

I pushd a commit that should hopefully fix the lint issue here.

synapse/rest/media/v1/media_repository.py

clokep

LGTM! Assuming CI passes.

Sorry for the delay!

clokep · 2020-09-29T14:16:25Z

@Half-Shot This seemed worth finishing up so hope you don't mind I pushed some commits. Can you take a quick look and make sure it still seems like it would do what you were seeing break?

Half-Shot · 2020-09-29T14:51:13Z

@Half-Shot This seemed worth finishing up so hope you don't mind I pushed some commits. Can you take a quick look and make sure it still seems like it would do what you were seeing break?

I can't approve it but I've updated the changelog to be more accurate, otherwise LGTM

clokep · 2020-09-29T14:55:52Z

Good call! I'll merge once the build passes.

changelog.d/7905.bugfix

@dklimpel

Synapse 1.21.0rc1 (2020-10-01) ============================== Features -------- - Require the user to confirm that their password should be reset after clicking the email confirmation link. ([\#8004](#8004)) - Add an admin API `GET /_synapse/admin/v1/event_reports` to read entries of table `event_reports`. Contributed by @dklimpel. ([\#8217](#8217)) - Consolidate the SSO error template across all configuration. ([\#8248](#8248), [\#8405](#8405)) - Add a configuration option to specify a whitelist of domains that a user can be redirected to after validating their email or phone number. ([\#8275](#8275), [\#8417](#8417)) - Add experimental support for sharding event persister. ([\#8294](#8294), [\#8387](#8387), [\#8396](#8396), [\#8419](#8419)) - Add the room topic and avatar to the room details admin API. ([\#8305](#8305)) - Add an admin API for querying rooms where a user is a member. Contributed by @dklimpel. ([\#8306](#8306)) - Add `uk.half-shot.msc2778.login.application_service` login type to allow appservices to login. ([\#8320](#8320)) - Add a configuration option that allows existing users to log in with OpenID Connect. Contributed by @BBBSnowball and @OmmyZhang. ([\#8345](#8345)) - Add prometheus metrics for replication requests. ([\#8406](#8406)) - Support passing additional single sign-on parameters to the client. ([\#8413](#8413)) - Add experimental reporting of metrics on expensive rooms for state-resolution. ([\#8420](#8420)) - Add experimental prometheus metric to track numbers of "large" rooms for state resolutiom. ([\#8425](#8425)) - Add prometheus metrics to track federation delays. ([\#8430](#8430)) Bugfixes -------- - Fix a bug in the media repository where remote thumbnails with the same size but different crop methods would overwrite each other. Contributed by @deepbluev7. ([\#7124](#7124)) - Fix inconsistent handling of non-existent push rules, and stop tracking the `enabled` state of removed push rules. ([\#7796](#7796)) - Fix a longstanding bug when storing a media file with an empty `upload_name`. ([\#7905](#7905)) - Fix messages not being sent over federation until an event is sent into the same room. ([\#8230](#8230), [\#8247](#8247), [\#8258](#8258), [\#8272](#8272), [\#8322](#8322)) - Fix a longstanding bug where files that could not be thumbnailed would result in an Internal Server Error. ([\#8236](#8236), [\#8435](#8435)) - Upgrade minimum version of `canonicaljson` to version 1.4.0, to fix an unicode encoding issue. ([\#8262](#8262)) - Fix longstanding bug which could lead to incomplete database upgrades on SQLite. ([\#8265](#8265)) - Fix stack overflow when stderr is redirected to the logging system, and the logging system encounters an error. ([\#8268](#8268)) - Fix a bug which cause the logging system to report errors, if `DEBUG` was enabled and no `context` filter was applied. ([\#8278](#8278)) - Fix edge case where push could get delayed for a user until a later event was pushed. ([\#8287](#8287)) - Fix fetching malformed events from remote servers. ([\#8324](#8324)) - Fix `UnboundLocalError` from occuring when appservices send a malformed register request. ([\#8329](#8329)) - Don't send push notifications to expired user accounts. ([\#8353](#8353)) - Fix a regression in v1.19.0 with reactivating users through the admin API. ([\#8362](#8362)) - Fix a bug where during device registration the length of the device name wasn't limited. ([\#8364](#8364)) - Include `guest_access` in the fields that are checked for null bytes when updating `room_stats_state`. Broke in v1.7.2. ([\#8373](#8373)) - Fix theoretical race condition where events are not sent down `/sync` if the synchrotron worker is restarted without restarting other workers. ([\#8374](#8374)) - Fix a bug which could cause errors in rooms with malformed membership events, on servers using sqlite. ([\#8385](#8385)) - Fix "Re-starting finished log context" warning when receiving an event we already had over federation. ([\#8398](#8398)) - Fix incorrect handling of timeouts on outgoing HTTP requests. ([\#8400](#8400)) - Fix a regression in v1.20.0 in the `synapse_port_db` script regarding the `ui_auth_sessions_ips` table. ([\#8410](#8410)) - Remove unnecessary 3PID registration check when resetting password via an email address. Bug introduced in v0.34.0rc2. ([\#8414](#8414)) Improved Documentation ---------------------- - Add `/_synapse/client` to the reverse proxy documentation. ([\#8227](#8227)) - Add note to the reverse proxy settings documentation about disabling Apache's mod_security2. Contributed by Julian Fietkau (@jfietkau). ([\#8375](#8375)) - Improve description of `server_name` config option in `homserver.yaml`. ([\#8415](#8415)) Deprecations and Removals ------------------------- - Drop support for `prometheus_client` older than 0.4.0. ([\#8426](#8426)) Internal Changes ---------------- - Fix tests on distros which disable TLSv1.0. Contributed by @danc86. ([\#8208](#8208)) - Simplify the distributor code to avoid unnecessary work. ([\#8216](#8216)) - Remove the `populate_stats_process_rooms_2` background job and restore functionality to `populate_stats_process_rooms`. ([\#8243](#8243)) - Clean up type hints for `PaginationConfig`. ([\#8250](#8250), [\#8282](#8282)) - Track the latest event for every destination and room for catch-up after federation outage. ([\#8256](#8256)) - Fix non-user visible bug in implementation of `MultiWriterIdGenerator.get_current_token_for_writer`. ([\#8257](#8257)) - Switch to the JSON implementation from the standard library. ([\#8259](#8259)) - Add type hints to `synapse.util.async_helpers`. ([\#8260](#8260)) - Simplify tests that mock asynchronous functions. ([\#8261](#8261)) - Add type hints to `StreamToken` and `RoomStreamToken` classes. ([\#8279](#8279)) - Change `StreamToken.room_key` to be a `RoomStreamToken` instance. ([\#8281](#8281)) - Refactor notifier code to correctly use the max event stream position. ([\#8288](#8288)) - Use slotted classes where possible. ([\#8296](#8296)) - Support testing the local Synapse checkout against the [Complement homeserver test suite](https://github.com/matrix-org/complement/). ([\#8317](#8317)) - Update outdated usages of `metaclass` to python 3 syntax. ([\#8326](#8326)) - Move lint-related dependencies to package-extra field, update CONTRIBUTING.md to utilise this. ([\#8330](#8330), [\#8377](#8377)) - Use the `admin_patterns` helper in additional locations. ([\#8331](#8331)) - Fix test logging to allow braces in log output. ([\#8335](#8335)) - Remove `__future__` imports related to Python 2 compatibility. ([\#8337](#8337)) - Simplify `super()` calls to Python 3 syntax. ([\#8344](#8344)) - Fix bad merge from `release-v1.20.0` branch to `develop`. ([\#8354](#8354)) - Factor out a `_send_dummy_event_for_room` method. ([\#8370](#8370)) - Improve logging of state resolution. ([\#8371](#8371)) - Add type annotations to `SimpleHttpClient`. ([\#8372](#8372)) - Refactor ID generators to use `async with` syntax. ([\#8383](#8383)) - Add `EventStreamPosition` type. ([\#8388](#8388)) - Create a mechanism for marking tests "logcontext clean". ([\#8399](#8399)) - A pair of tiny cleanups in the federation request code. ([\#8401](#8401)) - Add checks on startup that PostgreSQL sequences are consistent with their associated tables. ([\#8402](#8402)) - Do not include appservice users when calculating the total MAU for a server. ([\#8404](#8404)) - Typing fixes for `synapse.handlers.federation`. ([\#8422](#8422)) - Various refactors to simplify stream token handling. ([\#8423](#8423)) - Make stream token serializing/deserializing async. ([\#8427](#8427))

@dklimpel

Synapse 1.21.2 (2020-10-15) =========================== Debian packages and Docker images have been rebuilt using the latest versions of dependency libraries, including authlib 0.15.1. Please see bugfixes below. Security advisory ----------------- * HTML pages served via Synapse were vulnerable to cross-site scripting (XSS) attacks. All server administrators are encouraged to upgrade. ([\#8444](matrix-org/synapse#8444)) ([CVE-2020-26891](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26891)) This fix was originally included in v1.21.0 but was missing a security advisory. This was reported by [Denis Kasak](https://github.com/dkasak). Bugfixes -------- - Fix rare bug where sending an event would fail due to a racey assertion. ([\#8530](matrix-org/synapse#8530)) - An updated version of the authlib dependency is included in the Docker and Debian images to fix an issue using OpenID Connect. See [\#8534](matrix-org/synapse#8534) for details. Synapse 1.21.1 (2020-10-13) =========================== This release fixes a regression in v1.21.0 that prevented debian packages from being built. It is otherwise identical to v1.21.0. Synapse 1.21.0 (2020-10-12) =========================== No significant changes since v1.21.0rc3. As [noted in v1.20.0](https://github.com/matrix-org/synapse/blob/release-v1.21.0/CHANGES.md#synapse-1200-2020-09-22), a future release will drop support for accessing Synapse's [Admin API](https://github.com/matrix-org/synapse/tree/master/docs/admin_api) under the `/_matrix/client/*` endpoint prefixes. At that point, the Admin API will only be accessible under `/_synapse/admin`. Synapse 1.21.0rc3 (2020-10-08) ============================== Bugfixes -------- - Fix duplication of events on high traffic servers, caused by PostgreSQL `could not serialize access due to concurrent update` errors. ([\#8456](matrix-org/synapse#8456)) Internal Changes ---------------- - Add Groovy Gorilla to the list of distributions we build `.deb`s for. ([\#8475](matrix-org/synapse#8475)) Synapse 1.21.0rc2 (2020-10-02) ============================== Features -------- - Convert additional templates from inline HTML to Jinja2 templates. ([\#8444](matrix-org/synapse#8444)) Bugfixes -------- - Fix a regression in v1.21.0rc1 which broke thumbnails of remote media. ([\#8438](matrix-org/synapse#8438)) - Do not expose the experimental `uk.half-shot.msc2778.login.application_service` flow in the login API, which caused a compatibility problem with Element iOS. ([\#8440](matrix-org/synapse#8440)) - Fix malformed log line in new federation "catch up" logic. ([\#8442](matrix-org/synapse#8442)) - Fix DB query on startup for negative streams which caused long start up times. Introduced in [\#8374](matrix-org/synapse#8374). ([\#8447](matrix-org/synapse#8447)) Synapse 1.21.0rc1 (2020-10-01) ============================== Features -------- - Require the user to confirm that their password should be reset after clicking the email confirmation link. ([\#8004](matrix-org/synapse#8004)) - Add an admin API `GET /_synapse/admin/v1/event_reports` to read entries of table `event_reports`. Contributed by @dklimpel. ([\#8217](matrix-org/synapse#8217)) - Consolidate the SSO error template across all configuration. ([\#8248](matrix-org/synapse#8248), [\#8405](matrix-org/synapse#8405)) - Add a configuration option to specify a whitelist of domains that a user can be redirected to after validating their email or phone number. ([\#8275](matrix-org/synapse#8275), [\#8417](matrix-org/synapse#8417)) - Add experimental support for sharding event persister. ([\#8294](matrix-org/synapse#8294), [\#8387](matrix-org/synapse#8387), [\#8396](matrix-org/synapse#8396), [\#8419](matrix-org/synapse#8419)) - Add the room topic and avatar to the room details admin API. ([\#8305](matrix-org/synapse#8305)) - Add an admin API for querying rooms where a user is a member. Contributed by @dklimpel. ([\#8306](matrix-org/synapse#8306)) - Add `uk.half-shot.msc2778.login.application_service` login type to allow appservices to login. ([\#8320](matrix-org/synapse#8320)) - Add a configuration option that allows existing users to log in with OpenID Connect. Contributed by @BBBSnowball and @OmmyZhang. ([\#8345](matrix-org/synapse#8345)) - Add prometheus metrics for replication requests. ([\#8406](matrix-org/synapse#8406)) - Support passing additional single sign-on parameters to the client. ([\#8413](matrix-org/synapse#8413)) - Add experimental reporting of metrics on expensive rooms for state-resolution. ([\#8420](matrix-org/synapse#8420)) - Add experimental prometheus metric to track numbers of "large" rooms for state resolutiom. ([\#8425](matrix-org/synapse#8425)) - Add prometheus metrics to track federation delays. ([\#8430](matrix-org/synapse#8430)) Bugfixes -------- - Fix a bug in the media repository where remote thumbnails with the same size but different crop methods would overwrite each other. Contributed by @deepbluev7. ([\#7124](matrix-org/synapse#7124)) - Fix inconsistent handling of non-existent push rules, and stop tracking the `enabled` state of removed push rules. ([\#7796](matrix-org/synapse#7796)) - Fix a longstanding bug when storing a media file with an empty `upload_name`. ([\#7905](matrix-org/synapse#7905)) - Fix messages not being sent over federation until an event is sent into the same room. ([\#8230](matrix-org/synapse#8230), [\#8247](matrix-org/synapse#8247), [\#8258](matrix-org/synapse#8258), [\#8272](matrix-org/synapse#8272), [\#8322](matrix-org/synapse#8322)) - Fix a longstanding bug where files that could not be thumbnailed would result in an Internal Server Error. ([\#8236](matrix-org/synapse#8236), [\#8435](matrix-org/synapse#8435)) - Upgrade minimum version of `canonicaljson` to version 1.4.0, to fix an unicode encoding issue. ([\#8262](matrix-org/synapse#8262)) - Fix longstanding bug which could lead to incomplete database upgrades on SQLite. ([\#8265](matrix-org/synapse#8265)) - Fix stack overflow when stderr is redirected to the logging system, and the logging system encounters an error. ([\#8268](matrix-org/synapse#8268)) - Fix a bug which cause the logging system to report errors, if `DEBUG` was enabled and no `context` filter was applied. ([\#8278](matrix-org/synapse#8278)) - Fix edge case where push could get delayed for a user until a later event was pushed. ([\#8287](matrix-org/synapse#8287)) - Fix fetching malformed events from remote servers. ([\#8324](matrix-org/synapse#8324)) - Fix `UnboundLocalError` from occuring when appservices send a malformed register request. ([\#8329](matrix-org/synapse#8329)) - Don't send push notifications to expired user accounts. ([\#8353](matrix-org/synapse#8353)) - Fix a regression in v1.19.0 with reactivating users through the admin API. ([\#8362](matrix-org/synapse#8362)) - Fix a bug where during device registration the length of the device name wasn't limited. ([\#8364](matrix-org/synapse#8364)) - Include `guest_access` in the fields that are checked for null bytes when updating `room_stats_state`. Broke in v1.7.2. ([\#8373](matrix-org/synapse#8373)) - Fix theoretical race condition where events are not sent down `/sync` if the synchrotron worker is restarted without restarting other workers. ([\#8374](matrix-org/synapse#8374)) - Fix a bug which could cause errors in rooms with malformed membership events, on servers using sqlite. ([\#8385](matrix-org/synapse#8385)) - Fix "Re-starting finished log context" warning when receiving an event we already had over federation. ([\#8398](matrix-org/synapse#8398)) - Fix incorrect handling of timeouts on outgoing HTTP requests. ([\#8400](matrix-org/synapse#8400)) - Fix a regression in v1.20.0 in the `synapse_port_db` script regarding the `ui_auth_sessions_ips` table. ([\#8410](matrix-org/synapse#8410)) - Remove unnecessary 3PID registration check when resetting password via an email address. Bug introduced in v0.34.0rc2. ([\#8414](matrix-org/synapse#8414)) Improved Documentation ---------------------- - Add `/_synapse/client` to the reverse proxy documentation. ([\#8227](matrix-org/synapse#8227)) - Add note to the reverse proxy settings documentation about disabling Apache's mod_security2. Contributed by Julian Fietkau (@jfietkau). ([\#8375](matrix-org/synapse#8375)) - Improve description of `server_name` config option in `homserver.yaml`. ([\#8415](matrix-org/synapse#8415)) Deprecations and Removals ------------------------- - Drop support for `prometheus_client` older than 0.4.0. ([\#8426](matrix-org/synapse#8426)) Internal Changes ---------------- - Fix tests on distros which disable TLSv1.0. Contributed by @danc86. ([\#8208](matrix-org/synapse#8208)) - Simplify the distributor code to avoid unnecessary work. ([\#8216](matrix-org/synapse#8216)) - Remove the `populate_stats_process_rooms_2` background job and restore functionality to `populate_stats_process_rooms`. ([\#8243](matrix-org/synapse#8243)) - Clean up type hints for `PaginationConfig`. ([\#8250](matrix-org/synapse#8250), [\#8282](matrix-org/synapse#8282)) - Track the latest event for every destination and room for catch-up after federation outage. ([\#8256](matrix-org/synapse#8256)) - Fix non-user visible bug in implementation of `MultiWriterIdGenerator.get_current_token_for_writer`. ([\#8257](matrix-org/synapse#8257)) - Switch to the JSON implementation from the standard library. ([\#8259](matrix-org/synapse#8259)) - Add type hints to `synapse.util.async_helpers`. ([\#8260](matrix-org/synapse#8260)) - Simplify tests that mock asynchronous functions. ([\#8261](matrix-org/synapse#8261)) - Add type hints to `StreamToken` and `RoomStreamToken` classes. ([\#8279](matrix-org/synapse#8279)) - Change `StreamToken.room_key` to be a `RoomStreamToken` instance. ([\#8281](matrix-org/synapse#8281)) - Refactor notifier code to correctly use the max event stream position. ([\#8288](matrix-org/synapse#8288)) - Use slotted classes where possible. ([\#8296](matrix-org/synapse#8296)) - Support testing the local Synapse checkout against the [Complement homeserver test suite](https://github.com/matrix-org/complement/). ([\#8317](matrix-org/synapse#8317)) - Update outdated usages of `metaclass` to python 3 syntax. ([\#8326](matrix-org/synapse#8326)) - Move lint-related dependencies to package-extra field, update CONTRIBUTING.md to utilise this. ([\#8330](matrix-org/synapse#8330), [\#8377](matrix-org/synapse#8377)) - Use the `admin_patterns` helper in additional locations. ([\#8331](matrix-org/synapse#8331)) - Fix test logging to allow braces in log output. ([\#8335](matrix-org/synapse#8335)) - Remove `__future__` imports related to Python 2 compatibility. ([\#8337](matrix-org/synapse#8337)) - Simplify `super()` calls to Python 3 syntax. ([\#8344](matrix-org/synapse#8344)) - Fix bad merge from `release-v1.20.0` branch to `develop`. ([\#8354](matrix-org/synapse#8354)) - Factor out a `_send_dummy_event_for_room` method. ([\#8370](matrix-org/synapse#8370)) - Improve logging of state resolution. ([\#8371](matrix-org/synapse#8371)) - Add type annotations to `SimpleHttpClient`. ([\#8372](matrix-org/synapse#8372)) - Refactor ID generators to use `async with` syntax. ([\#8383](matrix-org/synapse#8383)) - Add `EventStreamPosition` type. ([\#8388](matrix-org/synapse#8388)) - Create a mechanism for marking tests "logcontext clean". ([\#8399](matrix-org/synapse#8399)) - A pair of tiny cleanups in the federation request code. ([\#8401](matrix-org/synapse#8401)) - Add checks on startup that PostgreSQL sequences are consistent with their associated tables. ([\#8402](matrix-org/synapse#8402)) - Do not include appservice users when calculating the total MAU for a server. ([\#8404](matrix-org/synapse#8404)) - Typing fixes for `synapse.handlers.federation`. ([\#8422](matrix-org/synapse#8422)) - Various refactors to simplify stream token handling. ([\#8423](matrix-org/synapse#8423)) - Make stream token serializing/deserializing async. ([\#8427](matrix-org/synapse#8427))

* commit '8238b55e0': Update description of server_name config option (#8415) Discard an empty upload_name before persisting an uploaded file (#7905) Don't table scan events on worker startup (#8419) Mypy fixes for `synapse.handlers.federation` (#8422)

Half-Shot added 2 commits July 19, 2020 19:15

Check media_type and upload_name before persisting file

5b955a2

Create 7905.bugfix

1f96b41

clokep added the X-Awaiting-Changes A contributed PR which needs changes and re-review before it can be merged label Jul 20, 2020

Fix lint

2bba403

clokep removed the X-Awaiting-Changes A contributed PR which needs changes and re-review before it can be merged label Jul 20, 2020

clokep requested a review from a team July 20, 2020 12:24

Update docstring, allow upload_name to be optional

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clokep reviewed Jul 20, 2020

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clokep requested a review from a team July 20, 2020 17:41

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Half-Shot added 3 commits July 31, 2020 15:13

Do not raise Errors at the handler level

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Check if upload_name is empty

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Merge branch 'develop' into hs/check-upload

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ShadowJonathan mentioned this pull request Sep 20, 2020

Centralize event/object schema checking #8361

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Be Pythonic.

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More lint.

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Update docstring.

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clokep changed the title ~~Check media_type and upload_name before persisting file~~ Discard empty upload_name before persisting file Sep 28, 2020

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clokep added 2 commits September 28, 2020 17:57

Merge remote-tracking branch 'origin/develop' into hs/check-upload

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Fix handling of none.

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Update changelog

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Update changelog.

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clokep merged commit c2bdf04 into develop Sep 29, 2020

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Discard empty upload_name before persisting file #7905

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