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feat(db): add length limits to unbounded text columns - #394
Nine string columns were unbounded text. This gives each an explicit maximum length, enforced in the database, and makes the API reject or shorten over-long input before it reaches the database.
Column
New limit
configuration.name
64
configuration.description
256
configuration.value
4096
discord_webhooks.name
64
discord_webhooks.webhook_token
128
user_oauth_connections.provider_key
16
user_oauth_connections.external_id
255
user_oauth_connections.display_name
64
api_token_reports.ip_country
4
New constants in ApiHardLimits, applied with HasMaxLength in OpenShockContext.
Migration AddStringLengthLimits changes the column types. Before each change it truncates any existing value longer than the new limit, so the migration cannot fail on existing rows.
Admin configuration and webhook requests are validated against the same limits (400 instead of a database error).
OAuth display names from the provider are truncated to the limit on write.
A Discord webhook URL whose token exceeds the limit is rejected as an unsupported webhook URL.
How was it tested?
All unit tests (Common.Tests, Cron.Tests) and integration tests (API.IntegrationTests, Cron.IntegrationTests) pass on this branch. The integration suites apply the new migration to a fresh PostgreSQL database.
The solution builds with warnings treated as errors, and EF reports no pending model changes after the migration.
Checked the longest existing value in each column in production: all are well below the new limits (closest is webhook_token at 68 of 128), so the truncation step changes no data.
Checklist
The change is focused on one thing.
Tests, formatter and linter pass locally.
Documentation is updated where behaviour changed.
No secrets, credentials or personal data are included.
If this touches device control, limits, sharing, authentication or firmware updates, the description says so and explains how it was tested.
Summary by CodeRabbit
Bug Fixes
Added maximum length limits for configuration names, descriptions, and values, as well as OAuth account details and Discord webhook names and tokens.
Requests with overlong configuration or webhook names are rejected, and Discord webhook URLs with overlong tokens are rejected.
OAuth account display names that exceed the limit are shortened when saved.
During the database update, over-limit values in affected fields are shortened. The update stops if a Discord webhook token exceeds its limit.
Truncating text no longer leaves a partial Unicode character at the end.
Give the configuration, Discord webhook, OAuth connection and token report country columns explicit maximum lengths instead of unbounded text. The migration truncates any longer existing value before changing each column type. Requests are validated against the same limits, the OAuth display name is truncated on write, and webhook URLs with an over-long token are rejected.
No actionable comments were generated in the recent review.
Walkthrough
The change adds shared string-length limits, applies them to API inputs and OAuth display names, validates Discord webhook tokens, and bounds selected database columns through an EF Core migration.
Shared constants define limits for configuration fields, OAuth values, and Discord webhook fields. Configuration and webhook-name DTOs validate maximum lengths. OAuth display names are truncated to the limit, and webhook URL validation rejects tokens over the limit. StringUtils.Truncate avoids ending a truncated string with half of a surrogate pair; tests cover both boundary cases.
Entity configuration and migration metadata apply string limits to database columns. The migration truncates over-limit values before narrowing columns, but fails if a webhook token exceeds its limit. Its Down method restores the columns to text but does not restore truncated values.
The new length limits are applied consistently in request validation, the data model and the migration. Webhook tokens that are too long now stop the migration rather than being cut. Existing over-limit names or OAuth identifiers are still truncated during migration, which could cause collisions or alter identities on installations whose data differs from production. Production has been checked and is within the limits, so the risk is small, but other installations should check these columns before upgrading.
Pre-merge checks: 4
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Title check
The title "feat(db): add length limits to unbounded text columns" matches the main change. The PR adds database-enforced maximum lengths to nine string columns, adds the matching ApiHardLimits constan…
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Explanation
The title "feat(db): add length limits to unbounded text columns" matches the main change. The PR adds database-enforced maximum lengths to nine string columns, adds the matching ApiHardLimits constants, and includes a migration that truncates existing values and alters the column types. The title names the primary change. It omits the API-side validation and OAuth truncation, which is acceptable because the title does not need to cover every detail.
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Actionable comments posted: 4
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @API/Services/OAuthConnection/OAuthConnectionService.cs:
- Line 63: Update the display-name truncation in OAuthConnectionService and the
corresponding write path in AccountService to preserve complete Unicode
characters at the length limit; reuse the surrogate-safe slicing behavior
established by StringUtils while retaining the existing maximum-length limit.
Review comments at @Common/Migrations/20261113184758_AddStringLengthLimits.cs:
- Line 51: Replace the truncating webhook_token update in the migration with a
check that rejects migration when any token exceeds 128 characters, reporting an
actionable error identifying the affected rows. Preserve the original
credentials and ensure the migration does not proceed with invalid rows.
- Line 27: Replace the truncating updates in the migration with preflight
validation that detects existing over-limit primary-key values and stops
migration with an actionable error. Apply this to the OAuth `ExternalId`,
webhook names, configuration names, and OAuth composite keys; preserve all
stored key values and check installations beyond the reported production audit.
- Line 73: Update the value-narrowing SQL in this migration to reject
configuration values exceeding 4096 characters instead of truncating them.
Require an explicit replacement for each over-limit value before narrowing the
column, preserving its original type and valid content.
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What does this change?
Nine string columns were unbounded
text. This gives each an explicit maximum length, enforced in the database, and makes the API reject or shorten over-long input before it reaches the database.configuration.nameconfiguration.descriptionconfiguration.valuediscord_webhooks.namediscord_webhooks.webhook_tokenuser_oauth_connections.provider_keyuser_oauth_connections.external_iduser_oauth_connections.display_nameapi_token_reports.ip_countryApiHardLimits, applied withHasMaxLengthinOpenShockContext.AddStringLengthLimitschanges the column types. Before each change it truncates any existing value longer than the new limit, so the migration cannot fail on existing rows.How was it tested?
Common.Tests,Cron.Tests) and integration tests (API.IntegrationTests,Cron.IntegrationTests) pass on this branch. The integration suites apply the new migration to a fresh PostgreSQL database.webhook_tokenat 68 of 128), so the truncation step changes no data.Checklist
Summary by CodeRabbit