Function for converting text to PDF

This Function converts a text file to PDF. It reads a text (.txt) file from a Oracle Cloud Infrastructure Object Storage Bucket, converts it into PDF and stores the converted file in the same bucket (with a .pdf extension)

• It's written in Go and uses gofpdf for text to PDF conversion
• Uses the OCI Go SDK to execute Object Storage read and write operations
• A custom Dockerfile is used to build the function

Pre-requisites

• Start by cloning this repository
• Create Oracle Cloud Infrastructure Object Storage bucket
• Collect the following information for you OCI tenancy (you'll need these in subsequent steps) - Tenancy OCID, User OCID of a user in the tenancy, OCI private key, OCI public key passphrase, OCI region, Object Storage namespace and name of the bucket you just created
• Copy your OCI private key to folder. If you don't already have one, please follow the documentation

Switch to correct context

• fn use context <your context name>
• Check using fn ls apps

Create application

fn create app text2pdf --annotation oracle.com/oci/subnetIds=<SUBNETS> --config TENANT_OCID=<TENANT_OCID> --config USER_OCID=<USER_OCID> --config FINGERPRINT=<FINGERPRINT> --config PASSPHRASE=<PASSPHRASE> --config REGION=<REGION> --config PRIVATE_KEY_NAME=<PRIVATE_KEY_NAME> --config NAMESPACE=<NAMESPACE> --config BUCKET_NAME=<BUCKET_NAME>

e.g.

fn create app text2pdf --annotation oracle.com/oci/subnetIds='["ocid1.subnet.oc1.phx.aaaaaaaaghmsma7mpqhqdhbgnby25u2zo4wqlrrcskvu7jg56dryxt3hgvkz"]' --config TENANT_OCID=ocid1.tenancy.oc1..aaaaaaaaydrjm77otncda2xn7qtv7l3hqnd3zxn2u6siwdhniibwfv4wwhta --config USER_OCID=ocid1.user.oc1..aaaaaaaa4seqx6jeyma46ldy4cbuv35q4l26scz5p4rkz3rauuoioo26qwmq --config FINGERPRINT=41:82:5f:44:ca:a1:2e:58:d2:63:6a:af:52:d5:3d:04 --config PASSPHRASE=1987 --config REGION=us-phoenix-1 --config PRIVATE_KEY_NAME=oci_private_key.pem --config NAMESPACE=oracle-functions --config BUCKET_NAME=test-bucket

Check

fn inspect app text2pdf

Deploy the application

• cd fn-text2pdf
• fn -v deploy --app text2pdf --build-arg PRIVATE_KEY_NAME=<private_key_name> e.g. fn -v deploy --app text2pdf --build-arg PRIVATE_KEY_NAME=oci_private_key.pem

Test

A sample text file (lorem.txt) has been provided to test the function

• Upload file to your object storage bucket,
• and then test using echo -n 'lorem.txt' | fn invoke text2pdf convert

If successful, you should see the following output - PDF lorem.pdf written to storage bucket - test-bucket. Now, you can download the PDF (lorem.pdf) from your Object Storage bucket