Variable Expansion REST Api Calls

cbtshare · 04-05-2019, 08:10 PM

Hello all,

I am on mac using bash 3.2 ...I am writing a curl command to communicate with a provider API but having some issue. My problem is I want to variablize the command but when I substitute double quotes for single quotes, it does not work

below works, but of course I cannot perform variable expansion due to the single quotes. I have tried alot based on google research, but nothing works, can anyone assist.

Code:

curl -X POST 'https://api
.json' \
     -H 'X-Api-Key:rr' -i \
     -H 'Content-Type: application/json' \
     -d \
'{
  "deployment": {
    "revision": "${VER}",
    "changelog": "${TEMP}",
    "description": "string",
    "user": "${USER}"
  }
}'

below doesn't work I get internal server error

Code:

curl -X POST "https://api..json" \
     -H "X-Api-Key:43439f" -i \
     -H "Content-Type: application/json" \
     -d \
"{
  "deployment": {
    "revision": "${VER}",
    "changelog": "${TEMP}",
    "description": "string",
    "user": "${USER}"
  }
}"

scasey · 04-05-2019, 08:27 PM

Your second example has nested double quotes. Try escaping the internal quotes, or changing them to single quotes.

cbtshare · 04-05-2019, 11:42 PM

Quote:

Originally Posted by scasey

Your second example has nested double quotes. Try escaping the internal quotes, or changing them to single quotes.

thank you. Is this what you mean?

Code:

curl -X POST "https://api.json" \
     -H "X-Api-Key:9f" -i \
     -H "Content-Type: application/json" \
     -d \
'{
  \"deployment\": {
    \"revision\": \"${VER}\",
    \"changelog\": \"${TEMP}\",
    \"description\": \"string\",
    \"user\": \"${USER}\"
  }
}'

It doesn't workl

scasey · 04-05-2019, 11:53 PM

Quote:

Originally Posted by cbtshare

thank you. Is this what you mean?

Code:

curl -X POST "https://api.json" \
     -H "X-Api-Key:9f" -i \
     -H "Content-Type: application/json" \
     -d \
“{
  \"deployment\": {
    \"revision\": \"${VER}\",
    \"changelog\": \"${TEMP}\",
    \"description\": \"string\",
    \"user\": \"${USER}\"
  }
}”

It doesn't workl

Yes, except leave the outer double quotes...
...and please share how it “doesn’t work”. We can’t help if you don’t tell us what’s happening.

When you get internal server error, what does the error log say? (Do you have access to the logs?)

cbtshare · 04-06-2019, 04:00 PM

Quote:

Originally Posted by scasey

Yes, except leave the outer double quotes...
...and please share how it “doesn’t work”. We can’t help if you don’t tell us what’s happening.

When you get internal server error, what does the error log say? (Do you have access to the logs?)

Yes, I mean I get internal server error. There are no other logs on my side other than below.

Code:

curl -X POST "https://ap.json"      -H "X-Api-Key:a6f" -i      -H "Content-Type: application/json"      -d "{
 \ "deployment\": {
   \" revision\": "${VER}",
    \"changelog\": "${TEMP}",
   \" description\": "string",
    \"user\": "${USER}"
  }
}"
HTTP/1.1 500 Internal Server Error
Proxied-By: Service Gateway
Content-Security-Policy: frame-ancestors *.newrelic.com
Content-Length: 8739
Content-Type: text/html; charset=utf-8
Date: Sat, 06 Apr 2019 20:55:21 GMT
Server: nginx
Status: 500 Internal Server Error
X-Rack-Cache: invalidate, pass
X-Request-Id: 71da81fb1e0be6a3c7cee5ede0868059
X-Runtime: 0.002438
Vary: Accept-Encoding

<!DOCTYPE html>

When it works I get the following, but obviously there is no variable expansion, so the data posted is incorrect.

Code:

curl -X POST 'https://api..json'      -H 'X-Api-Key:a69f' -i      -H 'Content-Type: application/json'      -d '{
  "deployment": {
    "revision": "${VER}",
    "changelog": "${TEMP}",
    "description": "string",
    "user": "${USER}"
  }
}'
HTTP/1.1 201 Created
Proxied-By: Service Gateway
Content-Security-Policy: frame-ancestors *.newrelic.com
Cache-Control: max-age=0, private, must-revalidate
Content-Length: 251
Content-Type: application/json
Date: Sat, 06 Apr 2019 21:00:51 GMT
Etag: "0f4be74620ce63d1cf"
Server: nginx
Status: 201 Created
X-Rack-Cache: invalidate, pass
X-Request-Id: 6772f79222f62df
X-Runtime: 0.178740
X-Ua-Compatible: IE=Edge,chrome=1

{"deployment":{"id":3127,"revision":"${VER}","changelog":"${TEMP}","description":"string","user":"${USER}","timestamp":"2019-04-06T14:00:51-07:00","links":{"application":2651}},"links":{"deployment.agent":"/v2/applications/{application_id}"}}

scasey · 04-06-2019, 04:19 PM

Quote:

Originally Posted by cbtshare

Yes, I mean I get internal server error. There are no other logs on my side other than below.

Code:

curl -X POST "https://ap.json"      -H "X-Api-Key:a6f" -i      -H "Content-Type: application/json"      -d "{
 \ "deployment\": {
   \" revision\": "${VER}",
    \"changelog\": "${TEMP}",
   \" description\": "string",
    \"user\": "${USER}"
  }
}"
[snip]

In this post, you didn't escape the first internal quote, but the space in front of it.

Have you tried reversing the quotes? Use double quotes around the entire -d option, and single quotes within.

Code:

-d "{
  'deployment': {
    'revision': '${VER}',
    'changelog': '${TEMP}',
    'description': 'string',
    'user': '${USER}'
  }
}"

cbtshare · 04-08-2019, 10:57 AM

Hello ,

Thank you for you assistance, but that would not work, since single quotes would negate variable expansion.

The answer is to input the json into a file and then call it within the curl call
cat <<EOF> FILE.TXT
{
"deployment": {
"revision": "${VER}",
"changelog": "${TEMP}",
"description": "string",
"user": "${USER}"
}
}
EOF

Using -d `cat FILE.TXT`