Replace original images with reduced and resized image #206

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1. glassdimlygr commented on Aug 3, 2020

   

   glassdimlygr

   on Aug 3, 2020

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   I created two lambdas, the first with a reduce task that watches /mysubdir/.jpg (for a simplified example) and moves it to /reduced/

   {
       "bucket": "mybucket",
       "backup": {
           "directory": "./original"
       },
       "keepExtension": true,
       "reduce": {
           "directory": "reduced",
           "quality": 70,
           "acl": "public-read",
           "cacheControl": "public, max-age=31536000"
       },
       "optimizers": {
           "pngquant": ["--speed=1", "--quality=60-90"],
           "mozjpeg": ["-optimize", "-progressive"],
           "gifsicle": ["-O3"]
       }
   }
   
   

   The second watches reduced/.jpg, resizes, and then moves to /mysubdir/, resizing to 100px max width (for example)

   {
     "bucket": "mybucket",
     "keepExtension": true,
     "resizes": [
       {
         "size": "100x8000>",
         "directory": "test",
         "cacheControl": null
       }
     ]
   }
   
   

   In order to replace the original image, it has to be done like that. I had lots of problems with overlapping event paths because Amazon doesn't allow for exclusions or wildcards in the path of events.

   But this works well enough. The only code change I had to make was in lib/S3FileSystem.js where I removed at line 24:

                   if ( "img-processed" in data.Metadata ) {
                       reject("Object was already processed.");
                   } else 
   

   I instead of looking for img-processed, I think this code ought to write and check for the ARN of the lambda. Normally I would make a PR, but I have to roll on.

   I also think a great improvement would be allowing events to chain. I feel like this library is great, but ultimately one wants an image that is both resized and reduced in the end--if one wants to resize it at all.

   It would also be great if the original file could be replaced. For instance, we return a URL to users after they upload their file, so we have to replace the original.