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@ -123,10 +123,7 @@ public class OWSLinkPreview: MTLModel {
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@objc
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public class func isInvalidContentError(_ error: Error) -> Bool {
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guard let error = error as? LinkPreviewError else {
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return false
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}
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guard let error = error as? LinkPreviewError else { return false }
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return error == .invalidContent
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}
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@ -253,12 +250,10 @@ public class OWSLinkPreview: MTLModel {
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return nil
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}
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attachment.save(with: transaction)
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return attachment.uniqueId
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}
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private func isValid() -> Bool {
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var hasTitle = false
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if let titleValue = title {
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@ -701,37 +696,36 @@ public class OWSLinkPreview: MTLModel {
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return promise
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}
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public class func getImagePreview(fromUrl imageUrl: String, transaction: YapDatabaseReadWriteTransaction) -> Promise<OWSLinkPreview> {
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// Get the mime types the url
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guard let imageFileExtension = fileExtension(forImageUrl: imageUrl),
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let imageMimeType = mimetype(forImageFileExtension: imageFileExtension) else {
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return Promise(error: LinkPreviewError.invalidInput)
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public class func getImagePreview(from url: String, in transaction: YapDatabaseReadWriteTransaction) -> Promise<OWSLinkPreview> {
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// Get the MIME type
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guard let imageFileExtension = fileExtension(forImageUrl: url), let imageMIMEType = mimetype(forImageFileExtension: imageFileExtension) else {
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return Promise(error: LinkPreviewError.invalidInput)
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}
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return downloadImage(url: imageUrl).map { data in
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// Make sure the downloaded image has the correct mime type
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guard let newImageMimeType = NSData(data: data).ows_guessMimeType() else {
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return downloadImage(url: url).map { data in
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// Make sure the downloaded image has the correct MIME type
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guard let newImageMIMEType = NSData(data: data).ows_guessMimeType() else {
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throw LinkPreviewError.invalidContent
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}
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// Save the attachment
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guard let attachmentId = saveAttachmentIfPossible(imageData: data, mimeType: newImageMimeType, transaction: transaction) else {
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Logger.verbose("Error: Failed to save attachment for \(imageUrl)")
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guard let attachmentId = saveAttachmentIfPossible(imageData: data, mimeType: newImageMIMEType, transaction: transaction) else {
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Logger.verbose("Failed to save attachment for: \(url).")
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throw LinkPreviewError.attachmentFailedToSave
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}
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// If we had a GIF and the data we have is not a GIF then we need to render a link preview without attachments
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if (imageMimeType == OWSMimeTypeImageGif && newImageMimeType != OWSMimeTypeImageGif) {
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return OWSLinkPreview(urlString: imageUrl, title: nil, imageAttachmentId: attachmentId)
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// If it's a GIF and the data we have is not a GIF then we need to render a link preview without attachments
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if (imageMIMEType == OWSMimeTypeImageGif && newImageMIMEType != OWSMimeTypeImageGif) {
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return OWSLinkPreview(urlString: url, title: nil, imageAttachmentId: attachmentId)
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}
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return OWSLinkPreview(urlString: imageUrl, title: nil, imageAttachmentId: attachmentId, isDirectAttachment: true)
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return OWSLinkPreview(urlString: url, title: nil, imageAttachmentId: attachmentId, isDirectAttachment: true)
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}
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}
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@objc(getImagePreviewFromUrl:transaction:)
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public class func objc_getImagePreview(url imageUrl: String, transaction: YapDatabaseReadWriteTransaction) -> AnyPromise {
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return AnyPromise.from(getImagePreview(fromUrl: imageUrl, transaction: transaction))
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public class func objc_getImagePreview(url: String, in transaction: YapDatabaseReadWriteTransaction) -> AnyPromise {
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return AnyPromise.from(getImagePreview(from: url, in: transaction))
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}
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public class func downloadImage(url imageUrl: String) -> Promise<Data> {
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@ -799,7 +793,7 @@ public class OWSLinkPreview: MTLModel {
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return Promise(error: LinkPreviewError.invalidContent)
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}
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// If we have a gif then don't download it as a jpg and also we need to ensure that it's a valid GIF
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// Loki: If it's a GIF then ensure it's validity and don't download it as a JPG
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if (imageMimeType == OWSMimeTypeImageGif && NSData(data: data).ows_isValidImage(withMimeType: OWSMimeTypeImageGif)) { return Promise.value(data) }
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let maxImageSize: CGFloat = 1024
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Niels Andriesse
6 years ago