Resize image attachments on by default with a 2MP cap - #6633
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aleksandar-apostolov merged 1 commit intoAug 13, 2026
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Backport of #6631 to v6. Introduces a StreamCdnImageResizer abstraction (StreamCdnMaxPixelsImageResizer capping images to 2MP by default for iOS parity, and NoOpStreamCdnImageResizer to opt out), turns image attachment resizing on by default, and deprecates the percentage-based StreamCdnImageResizing. Resizing is host-gated with an optional custom cdnHost for proxied/custom Stream CDN domains. Integrations that already enabled the legacy config keep their exact behavior.
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August 13, 2026 08:06
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WalkthroughAdds a max-pixel Stream CDN image resizer, custom host detection, legacy configuration deprecation, and integration across ChatUI, Compose themes, galleries, attachments, thumbnails, and avatars. ChangesStream CDN image resizing
Estimated code review effort: 4 (Complex) | ~45 minutes Mergeability Score: 🔵 Low · up to The PR enables image resizing by default, but malformed dimensions could produce invalid image URLs and the deprecated configuration’s automatic migration hint can generate incorrect code; the custom-host documentation also needs correction. These are bounded issues, so the PR is mergeable with explicit owner follow-up before or alongside merge. Sequence Diagram(s)sequenceDiagram
participant ChatUI
participant AttachmentView
participant applyStreamCdnImageResizing
participant StreamCdnImageResizer
participant StreamCdnMaxPixelsImageResizer
ChatUI->>AttachmentView: provide image resizer configuration
AttachmentView->>applyStreamCdnImageResizing: process image URL
applyStreamCdnImageResizing->>StreamCdnImageResizer: resizeUrl(imageUrl)
StreamCdnImageResizer->>StreamCdnMaxPixelsImageResizer: apply pixel budget
StreamCdnMaxPixelsImageResizer-->>AttachmentView: return resized URL
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 3
🔇 Additional comments (24)
stream-chat-android-client/api/stream-chat-android-client.api (1)
2837-2839: LGTM!stream-chat-android-client/src/main/java/io/getstream/chat/android/client/extensions/StringExtensions.kt (1)
28-41: LGTM!stream-chat-android-client/src/main/java/io/getstream/chat/android/client/helpers/AttachmentHelper.kt (1)
19-19: LGTM!stream-chat-android-ui-common/api/stream-chat-android-ui-common.api (1)
1253-1266: LGTM!stream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/images/resizing/StreamCdnImageResizing.kt (1)
37-41: LGTM!Also applies to: 58-63
stream-chat-android-compose/api/stream-chat-android-compose.api (1)
3235-3235: LGTM!Also applies to: 3251-3251
stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/theme/ChatTheme.kt (1)
34-34: LGTM!Also applies to: 81-83, 219-240, 355-357, 369-370, 431-431, 541-541, 811-825
stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/content/MediaAttachmentContent.kt (1)
205-209: LGTM!stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaGalleryInjector.kt (1)
20-20: LGTM!Also applies to: 37-52
stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaGalleryPreviewActivity.kt (1)
61-61: LGTM!Also applies to: 159-161
stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/internal/MediaGalleryPage.kt (1)
68-68: LGTM!Also applies to: 106-111
stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/content/MediaAttachmentQuotedContent.kt (1)
52-52: LGTM!Also applies to: 83-86
stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/components/avatar/Avatar.kt (1)
66-69: LGTM!stream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/images/resizing/StringExtensions.kt (1)
30-31: LGTM!Also applies to: 44-72
stream-chat-android-ui-common/src/test/kotlin/io/getstream/chat/android/ui/common/images/resizing/StreamCdnImageResizerTest.kt (1)
1-120: LGTM!stream-chat-android-ui-components/api/stream-chat-android-ui-components.api (1)
26-26: LGTM!Also applies to: 57-57
stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/ChatUI.kt (1)
31-33: LGTM!stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/overview/internal/MediaAttachmentAdapter.kt (1)
30-30: LGTM!Also applies to: 101-109
stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/messages/list/adapter/view/internal/DefaultQuotedAttachmentView.kt (1)
26-26: LGTM!Also applies to: 84-87
stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/messages/list/adapter/view/internal/MediaAttachmentView.kt (1)
32-32: LGTM!Also applies to: 136-146
stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/utils/AttachmentUtils.kt (1)
29-29: LGTM!Also applies to: 43-55
stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/widgets/avatar/UserAvatarView.kt (1)
28-28: LGTM!Also applies to: 101-104
stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/util/extensions/internal/AttachmentExtensions.kt (1)
25-25: LGTM!Also applies to: 43-49
stream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/images/resizing/StreamCdnImageResizer.kt (1)
53-66: 🗄️ Data Integrity & Integration | ⚪ InfoPlease verify the public constructor shape for
StreamCdnMaxPixelsImageResizer. The generated API dump shows a bare no-argument constructor alongside the full constructor and default-argument bridge. Confirm that this is intentional and is not an unintended@JvmOverloads-generated API; if it is unintended, remove the annotation or make the constructor shape explicit and regenerate the API dump.
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Inline comments:
In
`@stream-chat-android-client/src/main/java/io/getstream/chat/android/client/extensions/StringExtensions.kt`:
- Around line 53-56: Update the KDoc for the public host-matching API around the
cdnHost parameter to document the actual replacement behavior: a non-null custom
host is checked instead of the default Stream CDN pattern. Ensure the
corresponding KDoc occurrence near the additional host-matching description is
consistent, without changing matcher logic or tests.
- Around line 225-228: Update the image-resizing logic using
getStreamCdnHostedImageDimensions so it returns the original URL when either
originalWidth or originalHeight is nonpositive, before calculating totalPixels;
retain the existing pixel-limit behavior for valid dimensions and add a
regression test covering two negative dimensions.
In
`@stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/ChatUI.kt`:
- Around line 264-279: Remove the ReplaceWith annotation from the deprecated
streamCdnImageResizing property because its automatic replacement is
type-incompatible. Update the deprecation message to provide manual migration
guidance, explaining that percentage-based StreamCdnImageResizing configuration
has no direct one-token equivalent and users should configure
streamCdnImageResizer explicitly.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
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📒 Files selected for processing (25)
stream-chat-android-client/api/stream-chat-android-client.apistream-chat-android-client/src/main/java/io/getstream/chat/android/client/extensions/StringExtensions.ktstream-chat-android-client/src/main/java/io/getstream/chat/android/client/helpers/AttachmentHelper.ktstream-chat-android-client/src/test/java/io/getstream/chat/android/client/extensions/StringExtensionsKtTest.ktstream-chat-android-compose/api/stream-chat-android-compose.apistream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/content/MediaAttachmentContent.ktstream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/content/MediaAttachmentQuotedContent.ktstream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaGalleryInjector.ktstream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaGalleryPreviewActivity.ktstream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/internal/MediaGalleryPage.ktstream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/components/avatar/Avatar.ktstream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/theme/ChatTheme.ktstream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/util/extensions/internal/AttachmentExtensions.ktstream-chat-android-ui-common/api/stream-chat-android-ui-common.apistream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/images/resizing/StreamCdnImageResizer.ktstream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/images/resizing/StreamCdnImageResizing.ktstream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/images/resizing/StringExtensions.ktstream-chat-android-ui-common/src/test/kotlin/io/getstream/chat/android/ui/common/images/resizing/StreamCdnImageResizerTest.ktstream-chat-android-ui-components/api/stream-chat-android-ui-components.apistream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/ChatUI.ktstream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/overview/internal/MediaAttachmentAdapter.ktstream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/messages/list/adapter/view/internal/DefaultQuotedAttachmentView.ktstream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/messages/list/adapter/view/internal/MediaAttachmentView.ktstream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/utils/AttachmentUtils.ktstream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/widgets/avatar/UserAvatarView.kt
gpunto
approved these changes
Aug 13, 2026
aleksandar-apostolov
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port/v6/stream-cdn-image-resizing-default-on
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August 13, 2026 10:46
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Goal
Refs AND-1384 — backport of #6631 to
v6.Android downloaded full-resolution image originals (~2× the CDN bytes of iOS) because CDN resizing was off by default with no absolute cap. This turns resizing on by default at a 2MP cap, matching the iOS SDK.
Implementation
StreamCdnImageResizerinui-common:StreamCdnMaxPixelsImageResizer(default, caps to 2MP) andNoOpStreamCdnImageResizer(explicit opt-out).createResizedStreamCdnImageUrl(maxImagePixels, …)overload —sqrtscale, never upscales; host-gated with an optionalcdnHostfor proxied/custom Stream CDN domains (iOSStreamCDNRequester(cdnHost:)parity).ChatTheme(streamCdnImageResizer = …)andChatUI.streamCdnImageResizer. LegacyStreamCdnImageResizingdeprecated but honored when already enabled.🎨 UI Changes
No visual changes — bandwidth/behavior only. Over-2MP Stream CDN images are now fetched at ≤2MP.
Testing
:stream-chat-android-client:testDebugUnitTest --tests "*StringExtensionsKtTest":stream-chat-android-ui-common:testDebugUnitTest --tests "*StreamCdnImageResizerTest":stream-chat-android-compose:testDebugUnitTest --tests "*MediaGalleryPreviewActivityTest"spotlessCheck/detekt/apiDumpgreen on client, ui-common, compose, ui-components.☑️ Contributor Checklist
develop— N/A, this is thev6backport of Resize image attachments on by default with a 2MP cap #6631Summary by CodeRabbit
New Features
Deprecations