async setup()

in source/use_cases/aws-serverless-image-handler/lib/lambda/image-handler/image-request.js [23:64]
31 lines of code
10 McCabe index (conditional complexity)

    async setup(event) {
        try {
            this.requestType = this.parseRequestType(event);
            this.bucket = this.parseImageBucket(event, this.requestType);
            this.key = this.parseImageKey(event, this.requestType);
            this.edits = this.parseImageEdits(event, this.requestType);
            this.originalImage = await this.getOriginalImage(this.bucket, this.key);

            /* Decide the output format of the image.
             * 1) If the format is provided, the output format is the provided format.
             * 2) If headers contain "Accept: image/webp", the output format is webp.
             * 3) Use the default image format for the rest of cases.
             */
            let outputFormat = this.getOutputFormat(event);
            if (this.edits && this.edits.toFormat) {
                this.outputFormat = this.edits.toFormat;
            } else if (outputFormat) {
                this.outputFormat = outputFormat;
            }

            // Fix quality for Thumbor and Custom request type if outputFormat is different from quality type.
            if (this.outputFormat) {
                const requestType = ['Custom', 'Thumbor'];
                const acceptedValues = ['jpeg', 'png', 'webp', 'tiff', 'heif'];

                this.ContentType = `image/${this.outputFormat}`;
                if (requestType.includes(this.requestType) && acceptedValues.includes(this.outputFormat)) {
                    let qualityKey = Object.keys(this.edits).filter(key => acceptedValues.includes(key))[0];
                    if (qualityKey && (qualityKey !== this.outputFormat)) {
                        const qualityValue = this.edits[qualityKey];
                        this.edits[this.outputFormat] = qualityValue;
                        delete this.edits[qualityKey];
                    }
                }
            }

            return Promise.resolve(this);

        } catch (err) {
            return Promise.reject(err);
        }
    }