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Import files from Google Storage

The /google/import Robot imports whole directories of files from Google Storage.

Parameters

  • use

    String / Array of Strings / Objectrequired

    Specifies which Step(s) to use as input.

    • You can pick any names for Steps except ":original" (reserved for user uploads handled by Transloadit)

    • You can provide several Steps as input with arrays:

      "use": [
        ":original",
        "encoded",
        "resized"
      ]
      

    💡 That’s likely all you need to know about use, but you can view advanced use cases:

    › Advanced use cases
    • Step bundling. Some Robots can gather several Step results for a single invocation. For example, the /file/compress Robot would normally create one archive for each file passed to it. If you'd set bundle_steps to true, however, it will create one archive containing all the result files from all Steps you give it. To enable bundling, provide an object like the one below to the use parameter:

      "use": {
        "steps": [
          ":original",
          "encoded",
          "resized"
        ],
        "bundle_steps": true
      }
      

      This is also a crucial parameter for the /video/adaptive Robot, otherwise you'll generate 1 playlist for each viewing quality.
      Keep in mind that all input Steps must be present in your Template. If one of them is missing (for instance it is rejected by a filter), no result is generated because the Robot waits indefinitely for all input Steps to be finished.

      Here’s a demo that showcases Step bundling.

    • Group by original. Sticking with the /file/compress Robot example, you can set group_by_original to true, in order to create a separate archive for each of your uploaded or imported files, instead of creating one archive containing all originals (or one per resulting file). This is important for for the /media/playlist Robot where you'd typically set:

      "use": {
        "steps": [
          "segmented"
        ],
        "bundle_steps": true,
        "group_by_original": true
      }
      
    • Fields. You can be more discriminatory by only using files that match a field name by setting the fields property. When this array is specified, the corresponding Step will only be executed for files submitted through one of the given field names, which correspond with the strings in the name attribute of the HTML file input field tag for instance. When using a back-end SDK, it corresponds with myFieldName1 in e.g.: $transloadit->addFile('myFieldName1', './chameleon.jpg').

      This parameter is set to true by default, meaning all fields are accepted.

      Example:

      "use": {
        "steps": [ ":original" ],
        "fields": [ "myFieldName1" ]
      }
      
    • Use as. Sometimes Robots take several inputs. For instance, the /video/merge Robot can create a slideshow from audio and images. You can map different Steps to the appropriate inputs.

      Example:

      "use": {
        "steps": [
          { "name": "audio_encoded", "as": "audio" },
          { "name": "images_resized", "as": "image" }
        ]
      }
      

      Sometimes the ordering is important, for instance, with our concat Robots. In these cases, you can add an index that starts at 1. You can also optionally filter by the multipart field name. Like in this example, where all files are coming from the same source (end-user uploads), but with different <input> names:

      Example:

      "use": {
        "steps": [
          { "name": ":original", "fields": "myFirstVideo", "as": "video_1" },
          { "name": ":original", "fields": "mySecondVideo", "as": "video_2" },
          { "name": ":original", "fields": "myThirdVideo", "as": "video_3" }
        ]
      }
      

      For times when it is not apparent where we should put the file, you can use Assembly Variables to be specific. For instance, you may want to pass a text file to the /image/resize Robot to burn the text in an image, but you are burning multiple texts, so where do we put the text file? We specify it via ${use.text_1}, to indicate the first text file that was passed.

      Example:

      "watermarked": {
        "robot": "/image/resize",
        "use"  : {
          "steps": [
            { "name": "resized", "as": "base" },
            { "name": "transcribed", "as": "text" },
          ],
        },
        "text": [
          {
            "text"  : "Hi there",
            "valign": "top",
            "align" : "left",
          },
          {
            "text"    : "From the 'transcribed' Step: ${use.text_1}",
            "valign"  : "bottom",
            "align"   : "right",
            "x_offset": 16,
            "y_offset": -10,
          }
        ]
      }
      
  • credentials

    Stringrequired

    Create a new Google service account. Set its role to "Storage Object Creator". Choose "JSON" for the key file format and download it to your computer. You will need to upload this file when creating your Template Credentials.

    Go back to your Google credentials project and enable the "Google Cloud Storage JSON API" for it. Wait around ten minutes for the action to propagate through the Google network. Grab the project ID from the dropdown menu in the header bar on the Google site. You will also need it later on.

    Now you can set up the storage.objects.create and storage.objects.delete permissions. The latter is optional and only required if you intend to overwrite existing paths.

    To do this from the Google Cloud console, navigate to "IAM & Admin" and select "Roles". From here, select "+CREATE ROLE", enter a name, set the role launch stage as general availability and set the permissions stated above.

    Next, relocate to your storage browser and select the ellipsis on your bucket to edit bucket permissions. From here, select "ADD MEMBER", enter your service account as a new member and select your newly created role.

    Then, create your associated Template Credentials in your Transloadit account and use the name of your Template Credentials as this parameter's value.

  • path

    String / Array of Stringsrequired

    The path in your bucket to the specific file or directory. If the path points to a file, only this file will be imported. For example: images/avatar.jpg.

    If it points to a directory, indicated by a trailing slash (/), then all files that are direct descendants of this directory will be imported. For example: images/.

    Directories are not imported recursively. If you want to import files from subdirectories and sub-subdirectories, enable the recursive parameter.

    If you want to import all files from the root directory, please use / as the value here. In this case, make sure all your objects belong to a path. If you have objects in the root of your bucket that aren't prefixed with /, you'll receive a 404 GOOGLE_IMPORT_NOT_FOUND error.

    You can also use an array of path strings here to import multiple paths in the same Robot's Step.

  • recursive

    Boolean ⋅ default: false

    Setting this to true will enable importing files from subdirectories and sub-subdirectories (etc.) of the given path.

    Please use the pagination parameters start_file_name and files_per_page wisely here.

  • next_page_token

    String ⋅ default: ""

    A string token used for pagination. The returned files of one paginated call have the next page token inside of their meta data, which needs to be used for the subsequent paging call.

  • files_per_page

    Integer ⋅ default: 1000

    The pagination page size. This only works when recursive is true for now, in order to not break backwards compatibility in non-recursive imports.

  • ignore_errors

    Array of Strings / Boolean ⋅ default: []

    Possible array members are "meta" and "import".

    You might see an error when trying to extract metadata from your imported files. This happens, for example, for files with a size of zero bytes. Including "meta" in the array will cause the Robot to not stop the import (and the entire Assembly) when that happens.

    Including "import" in the array will ensure the Robot does not cease to function on any import errors either.

    To keep backwards compatibility, setting this parameter to true will set it to ["meta", "import"] internally.

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