Using variables in JSON

Question

Essentially what I'm trying to do is replace a few values in the JSON string with some variables that I have. Here's a snapshot of my code:

listproxies = ['proxy1', 'proxy2', 'proxy3']

PROXY = random.choice(listproxies)

proxy_host = PROXY[:-28]
proxy_port = '12345'
proxy_username = PROXY[25:-9]
proxy_password = 'password'

print("USING PROXY: "+proxy_host+":"+proxy_port+":"+proxy_username+":"+proxy_password)

manifest_json = """
{
    "version": "1.0.0",
    "manifest_version": 2,
    "name": "Chrome Proxy",
    "permissions": [
        "proxy",
        "tabs",
        "unlimitedStorage",
        "storage",
        "<all_urls>",
        "webRequest",
        "webRequestBlocking"
    ],
    "background": {
        "scripts": ["background.js"]
    },
    "minimum_chrome_version":"22.0.0"
}
"""

background_js = """
var config = {
        mode: "fixed_servers",
        rules: {
          singleProxy: {
            scheme: "http",
            host: """+proxy_host+""",
            port: parseInt("""+proxy_port+""")
          },
          bypassList: ["foobar.com"]
        }
      };

chrome.proxy.settings.set({value: config, scope: "regular"}, function() {});

function callbackFn(details) {
    return {
        authCredentials: {
            username: """+proxy_username+""",
            password: """+proxy_password+"""
        }
    };
}

chrome.webRequest.onAuthRequired.addListener(
            callbackFn,
            {urls: ["<all_urls>"]},
            ['blocking']
);
"""

As you can see, in background_js I'm trying to call the variables proxy_host and proxy_port , and then proxy_username & proxy_password further down, which doesn't seem to be working...

Answer 1

JSON格式仅允许使用双引号： ""使用单引号''或""" """不允许。

Answer 2

Use the builtin json library, and deal with this stuff as if it was a dictionary instead.

>> import json
>> manifest_as_json = json.loads(manifest_json)
>> manifest_as_json['version'] = 1.2.3
>>
>> import pprint
>> pprint.pprint(manifest_as_json)
{
    "version": "1.2.3",
    "manifest_version": 2,
    "name": "Chrome Proxy",
    "permissions": [
        "proxy",
        "tabs",
        "unlimitedStorage",
        "storage",
        "<all_urls>",
        "webRequest",
        "webRequestBlocking"
    ],
    "background": {
        "scripts": ["background.js"]
    },
    "minimum_chrome_version":"22.0.0"
}

Additionally, if you'd like to, you could use the fstrings in Python and just embed variables into the string:

>> pretty_proxy_host = f"This is my {proxy_host}"
>> print(pretty_proxy_host)
This is my proxy1