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How to string concatenate on bash and send it as json with curl?

Time:10-05

This is what I am trying to get working:

body="\"\:warning\: \:exclamation\: Your pull request is not linked to any issue, please make the corresponding changes in the very first comments body by adding \'Fixes #issue-number\' or \'Resolves #issue-number\'. If your pull request isn\'t linked to any issue, ignore this comment\!\""
echo $body
json="'{\"body\": ${body} }'"
echo $json
statusCode=`curl -X POST -H 'Accept: application/vnd.github json' -H 'Authorization: token ****' -H 'Content-Type: application/json' https://api.github.com/repos/Ismoh/NoitaMP/issues/79/comments -d $json`
echo "statusCode="$statusCode

echo $body:

$ echo $body
"\:warning\: \:exclamation\: Your pull request is not linked to any issue, please make the corresponding changes in the very first comments body by adding \'Fixes #issue-number\' or \'Resolves #issue-number\'. If your pull request isn\'t linked to any issue, ignore this comment\!"

echo $json

$ echo $json
'{"body": "\:warning\: \:exclamation\: Your pull request is not linked to any issue, please make the corresponding changes in the very first comments body by adding \'Fixes #issue-number\' or \'Resolves #issue-number\'. If your pull request isn\'t linked to any issue, ignore this comment\!" }'

curl

$ curl -X POST -H 'Accept: application/vnd.github json' -H 'Authorization: token ****' -H 'Content-Type: application/json
' https://api.github.com/repos/Ismoh/NoitaMP/issues/79/comments -d $json
{
  "message": "Problems parsing JSON",
  "documentation_url": "https://docs.github.com/rest/reference/issues#create-an-issue-comment"
}
curl: (3) URL using bad/illegal format or missing URL
curl: (3) URL using bad/illegal format or missing URL
curl: (6) Could not resolve host: Your
curl: (6) Could not resolve host: pull
curl: (6) Could not resolve host: request
curl: (6) Could not resolve host: is
curl: (6) Could not resolve host: not
curl: (6) Could not resolve host: linked
curl: (6) Could not resolve host: to
curl: (6) Could not resolve host: any
curl: (6) Could not resolve host: issue,
curl: (6) Could not resolve host: please
curl: (6) Could not resolve host: make
curl: (6) Could not resolve host: the
curl: (6) Could not resolve host: corresponding
curl: (6) Could not resolve host: changes
curl: (6) Could not resolve host: in
curl: (6) Could not resolve host: the
curl: (6) Could not resolve host: very
curl: (6) Could not resolve host: first
curl: (6) Could not resolve host: comments
curl: (6) Could not resolve host: body
curl: (6) Could not resolve host: by
curl: (6) Could not resolve host: adding
curl: (6) Could not resolve host: \'Fixes
curl: (3) URL using bad/illegal format or missing URL
curl: (6) Could not resolve host: or
curl: (6) Could not resolve host: \'Resolves
curl: (3) URL using bad/illegal format or missing URL
curl: (6) Could not resolve host: If
curl: (6) Could not resolve host: your
curl: (6) Could not resolve host: pull
curl: (6) Could not resolve host: request
curl: (6) Could not resolve host: isn\'t
curl: (6) Could not resolve host: linked
curl: (6) Could not resolve host: to
curl: (6) Could not resolve host: any
curl: (6) Could not resolve host: issue,
curl: (6) Could not resolve host: ignore
curl: (6) Could not resolve host: this
curl: (6) Could not resolve host: comment\!"
curl: (3) unmatched close brace/bracket in URL position 1:
}'

GitHub API Docs shows the json data as following:

curl \
  -X POST \
  -H "Accept: application/vnd.github json" \
  -H "Authorization: Bearer <YOUR-TOKEN>" \
  https://api.github.com/repos/OWNER/REPO/issues/ISSUE_NUMBER/comments \
  -d '{"body":"Me too"}'

Is anyone out there, who can tell me what I am doing wrong?

Is there a better way to escape string for json usage? I already tried out jq -Rsa ., but didn't work either.

CodePudding user response:

Here's how to build that JSON with jq:

body="\"\:warning\: \:exclamation\: Your pull request is not linked to any issue, please make the corresponding changes in the very first comments body by adding \'Fixes #issue-number\' or \'Resolves #issue-number\'. If your pull request isn\'t linked to any issue, ignore this comment\!\""
json=$(jq --arg body "$body" '{ $body }')
# or: json=$(printf '%s\n' "$body" | jq -R '{ body: . }')

I doubt that all that escaping above is actually necessary – why escape a colon, an exclamation mark or a single quote? But it might be that the API expects these character quoted; I don't see why though, since it consumes JSON. Best bet is probably to get rid of all the backslashes above when assigning body (except the ones before ").

Here's how to correctly expand a variable which contains whitespace, for instance when using it as payload for a curl command (note the quotes around the variable). Variables should always be quoted, unless you know 110% what you are doing:

curl -X POST \
 -H 'Accept: application/vnd.github json' \
 -H 'Authorization: token ****' \
 -H 'Content-Type: application/json' \
 https://api.github.com/repos/Ismoh/NoitaMP/issues/79/comments \
 -d "$json"

Useful resources:

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