selecting and filtering cloudflare pagerules with jq - select

Question

I was trying to work out the best way to filter out some pagerules data from Cloudflare, and while I've got a solution I'm looking at how ugly it is and thinking "there has to be a simpler way to do this."
I'm specifically asking about a better way to achieve the following goal using jq. I understand there are programming libraries I could use to accomplish the same, but the point of this question is to get a better understanding of how jq is intended to work.
Say I've got a long list of CloudFlare pagerules records, here are a few entries as a minimal example:
{
"example.org": [
{
"id": "341",
"targets": [
{
"target": "url",
"constraint": {
"operator": "matches",
"value": "http://ng.example.org/*"
}
}
],
"actions": [
{
"id": "always_use_https"
}
],
"priority": 12,
"status": "active",
"created_on": "2017-11-29T18:07:36.000000Z",
"modified_on": "2020-09-02T16:09:03.000000Z"
},
{
"id": "406",
"targets": [
{
"target": "url",
"constraint": {
"operator": "matches",
"value": "http://nz.example.org/*"
}
}
],
"actions": [
{
"id": "always_use_https"
}
],
"priority": 9,
"status": "active",
"created_on": "2017-11-29T18:07:55.000000Z",
"modified_on": "2020-09-02T16:09:03.000000Z"
},
{
"id": "427",
"targets": [
{
"target": "url",
"constraint": {
"operator": "matches",
"value": "nz.example.org/*"
}
}
],
"actions": [
{
"id": "ssl",
"value": "flexible"
}
],
"priority": 8,
"status": "active",
"created_on": "2017-11-29T18:08:00.000000Z",
"modified_on": "2020-09-02T16:09:03.000000Z"
}
]
}
What I want to do is extract the urls nested in the constraint.value fields for the always_use_https actions. The goal is to extract the values and return them as a json array. What I came up with is this:
jq '[
[
[
[
.[] | .[] | select(.actions[].id | contains("always_use_https"))
] | .[].targets[] | select(.target | contains("url"))
] | .[] | .constraint | select(.operator | contains("matches"))
] | .[].value
]'
Against our example this produces:
[
"http://ng.example.org/*",
"http://nz.example.org/*"
]
Is there a more succinct way to achieve this in jq?

Answer 1

This produces the expected output in accordance with the criteria as I understand them:
jq '.["example.org"]
| map(select( any(.actions[]; .id == "always_use_https"))
| .targets[]
| select(.target == "url")
| .constraint.value )
' cloudfare.json