online-judge-tools/api-client

What is this?

This is an API client for various online judges, used as the backend library of oj command. You can use the Python library (onlinejudge module) and the command-line interface (oj-api command) which talks JSON compatible with jmerle/competitive-companion.

How to install

$ pip3 install online-judge-api-client

Supported websites

website	get sample cases	get system cases	get metadata	get contest data	login service	submit code
Aizu Online Judge	✔️	✔️
Anarchy Golf	✔️	❔ (same to samples)
AtCoder	✔️	✔️	✔️	✔️	✔️	✔️
AtCoder Problems (virtual contests)				✔️
CodeChef	✔️		✔️	✔️	❔
Codeforces	✔️		✔️	✔️	✔️	❌ issue
CS Academy	✔️
Facebook Hacker Cup	✔️
Google Code Jam	✔️
Google Kick Start	✔️
HackerRank	✔️	✔️			❔	✔️
Kagamiz Contest System	❌				❔	✔️
Kattis	✔️
Library Checker	✔️	✔️
PKU JudgeOnline	✔️
Sphere Online Judge	✔️
Topcoder	✔️ (archived problems only)		❔
Toph	✔️				❔	✔️
yukicoder	✔️	✔️		✔️	❔	✔️

Instead of login-service, you can use oj command with Selenium as oj login https://.... This can login almost all services.

Supported subcommands of oj-api command

get-problem

oj-api get-problem PROBLEM_URL parses the given problem and prints the results as JSON compatible with jmerle/competitive-companion.

options

• --system: get system cases, instead of sample cases
• --full: dump all additional data

format

• url: the URL of the problem
• name: the name of the problem. This doesn't include alphabets (e.g. just "Xor Sum" is used instead of "D. Xor Sum") because such alphabets are attributes belonging to the relation between problems and contests rather than belonging to only problems. (not compatible to jmerle/competitive-companion)
• context:
  • contest (optional): - url: the URL of the contest - name: the name of the contest
  • alphabet (optional): the alphabet of the problem in the contest
• memoryLimit: the memory limit in megabytes (MB); not mebibytes (MiB). They sometimes become non-integers, but be rounded down for the compatibility reason with jmerle/competitive-companion.
• timeLimit: the time limit in milliseconds (msec)
• tests:
  • input: the input of the test case
  • output: the output of the test case

format (additional)

• tests:
  • name (optional, when --system): the name of the system case (e.g. random-004.in, fft_killer_01, 99_hand.txt)
• availableLanguages (optional, when --full):
  • id: the ID of language to submit the server (e.g. 3003)
  • description: the description of the language to show to users (e.g. C++14 (GCC 5.4.1))
• raw (optional, when --full):
  • html (optional): the raw HTML used internally. This might contain sensitive info like CSRF tokens.
  • json (optional): the raw JSON used internally. This might contain sensitive info like access tokens.
  • etc.

example

$ oj-api get-problem https://atcoder.jp/contests/arc100/tasks/arc100_b | jq .result
{
  "url": "https://atcoder.jp/contests/arc100/tasks/arc100_b",
  "name": "Equal Cut",
  "context": {
    "contest": {
      "url": "https://atcoder.jp/contests/arc100",
      "name": "AtCoder Regular Contest 100"
    },
    "alphabet": "D"
  },
  "memoryLimit": 1024,
  "timeLimit": 2000,
  "tests": [
    {
      "input": "5\n3 2 4 1 2\n",
      "output": "2\n"
    },
    {
      "input": "10\n10 71 84 33 6 47 23 25 52 64\n",
      "output": "36\n"
    },
    {
      "input": "7\n1 2 3 1000000000 4 5 6\n",
      "output": "999999994\n"
    }
  ]
}

get-problem --compatibility

oj-api get-problem --compatibility PROBLEM_URL is the variant of get-problem strictly compatible with jmerle/competitive-companion.

format

See the document of jmerle/competitive-companion.

example

{
  "name": "D. Equal Cut",
  "group": "AtCoder Regular Contest 100",
  "url": "https://atcoder.jp/contests/arc100/tasks/arc100_b",
  "interactive": false,
  "memoryLimit": 1024,
  "timeLimit": 2000,
  "tests": [
    {
      "input": "5\n3 2 4 1 2\n",
      "output": "2\n"
    },
    {
      "input": "10\n10 71 84 33 6 47 23 25 52 64\n",
      "output": "36\n"
    },
    {
      "input": "7\n1 2 3 1000000000 4 5 6\n",
      "output": "999999994\n"
    }
  ],
  "testType": "single",
  "input": {
    "type": "stdin"
  },
  "output": {
    "type": "stdout"
  },
  "languages": {
    "java": {
      "mainClass": "Main",
      "taskClass": "Task"
    }
  }
}

get-contest

oj-api get-contest CONTEST_URL parses the given contest and prints the results as JSON.

format

• url: the URL of the contest
• name: the name of the contest
• problems: problems. For details, see the description of get-problem.

example

$ oj-api get-contest https://atcoder.jp/contests/arc100 | jq .result
{
  "url": "https://atcoder.jp/contests/arc100",
  "name": "AtCoder Regular Contest 100",
  "problems": [
    {
      "url": "https://atcoder.jp/contests/arc100/tasks/arc100_a",
      "name": "Linear Approximation",
      "context": {
        "contest": {
          "url": "https://atcoder.jp/contests/arc100",
          "name": "AtCoder Regular Contest 100"
        },
        "alphabet": "C"
      }
    },
    {
      "url": "https://atcoder.jp/contests/arc100/tasks/arc100_b",
      "name": "Equal Cut",
      "context": {
        "contest": {
          "url": "https://atcoder.jp/contests/arc100",
          "name": "AtCoder Regular Contest 100"
        },
        "alphabet": "D"
      }
    },
    {
      "url": "https://atcoder.jp/contests/arc100/tasks/arc100_c",
      "name": "Or Plus Max",
      "context": {
        "contest": {
          "url": "https://atcoder.jp/contests/arc100",
          "name": "AtCoder Regular Contest 100"
        },
        "alphabet": "E"
      }
    },
    {
      "url": "https://atcoder.jp/contests/arc100/tasks/arc100_d",
      "name": "Colorful Sequences",
      "context": {
        "contest": {
          "url": "https://atcoder.jp/contests/arc100",
          "name": "AtCoder Regular Contest 100"
        },
        "alphabet": "F"
      }
    }
  ]
}

get-service

oj-api get-service SERVICE_URL prints the data of the service.

options

• --list-contests: list all contests in the service

format

• url: the URL of the service
• name: the name of the service
• contests (when --list-contests): contests. For details, see the description of get-problem.

example

$ oj-api get-service https://atcoder.jp/ --list-contests | jq .result
{
  "url": "https://atcoder.jp/",
  "name": "AtCoder",
  "contests": [
    {
      "url": "https://atcoder.jp/contests/abc162",
      "name": "AtCoder Beginner Contest 162"
    },
    {
      "url": "https://atcoder.jp/contests/judge-update-202004",
      "name": "Judge System Update Test Contest 202004"
    },
    {
      "url": "https://atcoder.jp/contests/abc161",
      "name": "AtCoder Beginner Contest 161"
    },
    {
      "url": "https://atcoder.jp/contests/abc160",
      "name": "AtCoder Beginner Contest 160"
    },
    ...
  ]
}

login-service

USERNAME=USERNAME PASSWORD=PASSWORD oj-api login-service SERVICE_URL logs in the given service.

options

• --check: only check whether you are already logged in, without trying to log in

format

• loggedIn: the result

example

$ USERNAME=kimiyuki PASSWORD='????????????????' oj-api login-service https://atcoder.jp/ | jq .result
{
  "loggedIn": true
}

submit-code

oj-api submit-code PROBLEM_URL --file FILE --language LANGUAGE_ID submits the file to the given problem. You can obtrain the LANGUAGE_ID from the list availableLanguages of oj-api get-problem --full PROBLEM_URL or the guess-language-id subcommand.

format

• url: the URL of the submission result

example

$ oj-api submit-code https://atcoder.jp/contests/abc160/tasks/abc160_a --file main.py --language 3023 | jq .result
{
  "url": "https://atcoder.jp/contests/abc160/submissions/11991846"
}

guess-language-id

oj-api guess-language-id PROBLEM_URL --file FILE guesses the language id to submit the file to the given problem.

format

• id: the language id
• description: the description of the language id

example

$ oj-api guess-language-id http://codeforces.com/contest/1373/problem/A --file=main.py | jq .result
{
  "id": "31",
  "description": "Python 3.7.2",
}

JSON API responses

format

• status: the status. This contains ok if the subcommand succeeded.
• messages: error messages
• result: the result

example

$ USERNAME=chokudai PASSWORD=hoge oj-api login-service https://atcoder.jp/ | jq .
{
  "status": "error",
  "messages": [
    "onlinejudge.type.LoginError: failed to login"
  ],
  "result": null
}

Tips

For end-users who don't develop any programs:

• Please use the oj command instead of this oj-api command.
  • The oj-api command is intended to be used as a backend of other programs. It's not a frontend which humans use directly.

For developers of programs which use oj-api:

• Please be polite to judge servers.
  • We are accessing the web pages using the unintended way, i.e. without GUI browsers. We should not forget that this is basically not welcomed.
• Please be aware that this package uses Semantic Versioning.
  • The "public API" of this package is the documented features of oj-api command and the documented modules of onlinejudge module.
• You can also use the oj login command to login servers with GUI browsers.
  • The implementation around authentication is very complicated and fragile. For example, Codeforces has four methods to login: password, Gmail, Facebook, and ICPC. So we need to use GUI browsers for the development cost and stability.
  • This feature of oj login might be imported to oj-api command in the future.