How to interpolate several values contained in a variable into a json string - bash

Question

I have a parsed variable obtained after parsing some text:
parsed=$(echo "PA-232 message1 GX-1234 message2 PER-10 message3" | grep -Eo '[A-Z]+-[0-9]+')
parsed contains a bunch of ids:
echo $parsed
PA-232
GX-1234
PER-10
The next thing I have to do in my script is generate a json text and invoke an API with it:
The json text should be
"{\"tasks\": [{\"taskId\": \"PA-232\"}, {\"taskId\": \"GX-1234\"}, {\"taskId\": \"PER-10\"}], \"projectId\": \"$CI_PROJECT_ID\" }"
Notice CI_PROJECT_ID is an envvar that I also have to send, thats why I needed to use double quotes and escape them.
And it would be called with curl:
curl -X POST -H 'Content-Type:application/json' -k -u $CLIENT_ID:$CLIENT_SECRET 'https://somewhere.com/api/tasks' -d "{\"tasks\": [{\"taskId\": \"PA-232\"}, {\"taskId\": \"GX-1234\"}, {\"taskId\": \"PER-10\"}], \"projectId\": \"$CI_PROJECT_ID\"}"
The question is how can I generate a json string like the one shown above from the parsed variable and the additional envvar?

Answer 1

How about doing it with jq?
CI_PROJECT_ID='I want this " to be escaped automatically'
echo 'PA-232 message1 GX-1234 message2 PER-10 message3' |
jq -R --arg ciProjectId "$CI_PROJECT_ID" '
{
tasks: [
capture( "(?<taskId>[[:upper:]]+-[[:digit:]]+)"; "g" )
],
projectId: $ciProjectId
}
'
{
"tasks": [
{
"taskiD": "PA-232"
},
{
"taskiD": "GX-1234"
},
{
"taskiD": "PER-10"
}
],
"projectId": "I want this \" to be escaped automatically"
}
note: you can use jq -c ... for outputting a compact JSON
And here's a solution without jq that doesn't escape the characters in the strings so it might generate invalid JSON:
CI_PROJECT_ID='no escaping needed'
tasks_jsonArr=$(
echo "PA-232 message1 GX-1234 message2 PER-10 message3" |
grep -Eo '[A-Z]+-[0-9]+' |
sed 's/.*/{ "taskiD": "&" }/' |
paste -sd ',' |
sed 's/.*/[ & ]/'
)
curl -k 'https://somewhere.com/api/tasks' \
-X POST \
-H 'Content-Type:application/json' \
-u "$CLIENT_ID:$CLIENT_SECRET" \
-d "{\"tasks\": $tasks_jsonArr, \"projectId\": \"$CI_PROJECT_ID\"}"
N.B. For JSON-escaping strings with standard tools, take a look at function json_stringify in awk