npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@stratumn/postgraphile-plugin-connection-filter

v1.0.0-beta.19

Published

Advanced filtering of list types in PostGraphile

Downloads

1

Readme

Package on npm

postgraphile-plugin-connection-filter

This plugin adds a filter argument for advanced filtering of list types.

Warning: Use of this plugin (particularly with the default options) may make it astoundingly trivial for a malicious actor (or a well-intentioned application that generates complex GraphQL queries) to overwhelm your database with expensive queries. See the Performance and Security section below for details.

Performance and Security

By default, this plugin:

  • Exposes a large number of filter operators, including some that can perform expensive pattern matching.
  • Allows filtering on computed columns, which can result in expensive operations.
  • Allows filtering on functions that return setof, which can result in expensive operations.
  • Allows filtering on List fields (Postgres arrays), which can result in expensive operations.

To protect your server, you can:

  • Use the connectionFilterAllowedFieldTypes and connectionFilterAllowedOperators options to limit the filterable fields and operators exposed through GraphQL.
  • Set connectionFilterComputedColumns: false to prevent filtering on computed columns.
  • Set connectionFilterSetofFunctions: false to prevent filtering on functions that return setof.
  • Set connectionFilterLists: false to prevent filtering on List fields (Postgres arrays).

Also see the Production Considerations page of the official PostGraphile docs, which discusses query whitelisting.

Getting Started

CLI

postgraphile --append-plugins `pwd`/path/to/this/plugin/index.js

Library

const express = require("express");
const { postgraphile } = require("postgraphile");
const PostGraphileConnectionFilterPlugin = require("postgraphile-plugin-connection-filter");

const app = express();

app.use(
  postgraphile(pgConfig, schema, {
    graphiql: true,
    appendPlugins: [PostGraphileConnectionFilterPlugin],
  })
);

app.listen(5000);

Operators

The following filter operators are exposed by default:

Logical Operators

| Postgres operator | GraphQL field | GraphQL field type | --- | --- | --- | | AND | and | List | | OR | or | List | | NOT | not | Object |

Comparison Operators

| Postgres expression | GraphQL field | GraphQL field type | | --- | --- | --- | | IS [NOT] NULL | isNull | Boolean | | = | equalTo | Scalar/Enum | | <> | notEqualTo | Scalar/Enum | | IS DISTINCT FROM | distinctFrom | Scalar/Enum | | IS NOT DISTINCT FROM | notDistinctFrom | Scalar/Enum | | < | lessThan | Scalar/Enum | | <= | lessThanOrEqualTo | Scalar/Enum | | > | greaterThan | Scalar/Enum | | >= | greaterThanOrEqualTo | Scalar/Enum | | IN | in | List | | NOT IN | notIn | List | | LIKE '%...%' | includes | String | | NOT LIKE '%...%' | notIncludes | String | | ILIKE '%...%' | includesInsensitive | String | | NOT ILIKE '%...%' | notIncludesInsensitive | String | | LIKE '...%' | startsWith | String | | NOT LIKE '...%' | notStartsWith | String | | ILIKE '...%' | startsWithInsensitive | String | | NOT ILIKE '...%' | notStartsWithInsensitive | String | | LIKE '%...' | endsWith | String | | NOT LIKE '%...' | notEndsWith | String | | ILIKE '%...' | endsWithInsensitive | String | | NOT ILIKE '%...' | notEndsWithInsensitive | String | | LIKE '...' | like | String | | NOT LIKE '...' | notLike | String | | ILIKE '...' | likeInsensitive | String | | NOT ILIKE '...' | notLikeInsensitive | String | | SIMILAR TO '...' | similarTo | String | | NOT SIMILAR TO '...' | notSimilarTo | String | | @> | contains | JSON | | <@ | containedBy | JSON | | << | inetContainedBy | InternetAddress | | <<= | inetContainedByOrEquals | InternetAddress | | >> | inetContains | InternetAddress | | >>= | inetContainsOrEquals | InternetAddress | | && | inetContainsOrIsContainedBy | InternetAddress |

List Comparison Operators

| Postgres expression | GraphQL field | GraphQL field type | | --- | --- | --- | | IS [NOT] NULL | isNull | Boolean | | = | equalTo | List | | <> | notEqualTo | List | | IS DISTINCT FROM | distinctFrom | List | | IS NOT DISTINCT FROM | notDistinctFrom | List | | < | lessThan | List | | <= | lessThanOrEqualTo | List | | > | greaterThan | List | | >= | greaterThanOrEqualTo | List | | = ANY() | anyEqualTo | Scalar/Enum | | <> ANY() | anyNotEqualTo | Scalar/Enum | | > ANY() | anyLessThan | Scalar/Enum | | >= ANY() | anyLessThanOrEqualTo | Scalar/Enum | | < ANY() | anyGreaterThan | Scalar/Enum | | <= ANY() | anyGreaterThanOrEqualTo | Scalar/Enum |

Examples

query {
  allPosts(filter: {
    body: { isNull: true }
  }) {
    ...
  }
}
query {
  allPosts(filter: {
    body: { isNull: false }
  }) {
    ...
  }
}
query {
  allPosts(filter: {
    createdAt: { greaterThan: "2016-01-01" }
  }) {
    ...
  }
}
query {
  allPosts(filter: {
    authorId: { in: [1, 2] }
  }) {
    ...
  }
}

Note: Objects with multiple keys are interpreted with an implicit AND between the conditions.

query {
  allPosts(filter: {
    body: { isNull: false },
    createdAt: { greaterThan: "2016-01-01" }
  }) {
    ...
  }
}
query {
  allPosts(filter: {
    or: [
      { authorId: { equalTo: 6 } },
      { createdAt: { greaterThan: "2016-01-01" } }
    ]
  }) {
    ...
  }
}
query {
  allPosts(filter: {
    not: {
      or: [
        { authorId: { equalTo: 6 } },
        { createdAt: { greaterThan: "2016-01-01" } }
      ]
    }
  }) {
    ...
  }
}
query {
  allPeople(filter: {
    firstName: { startsWith:"John" }
  }) {
    nodes {
      firstName
      lastName
      postsByAuthorId(filter: {
        createdAt: { greaterThan: "2016-01-01" }
      }) {
        nodes {
          ...
        }
      }
    }
  }
}

Requires connectionFilterRelations: true

query {
  allPosts(filter: {
    personByAuthorId: { createdAt: { greaterThan: "2018-01-01" } }
  }) {
    ...
  }
}

Requires connectionFilterRelations: true

query {
  allPeople(filter: {
    accountByPersonId: { status: { equalTo: ACTIVE } }
  }) {
    ...
  }
}

Not supported yet. #26

For additional examples, see the tests.

Plugin Options

When using PostGraphile as a library, the following plugin options can be passed via graphileBuildOptions:

Restrict filtering to specific operators:

postgraphile(pgConfig, schema, {
  graphileBuildOptions: {
    connectionFilterAllowedOperators: [
      "isNull",
      "equalTo",
      "notEqualTo",
      "distinctFrom",
      "notDistinctFrom",
      "lessThan",
      "lessThanOrEqualTo",
      "greaterThan",
      "greaterThanOrEqualTo",
      "in",
      "notIn",
    ],
  },
})

For a full list of the available operators, see the Comparison Operators table above.

Restrict filtering to specific field types:

postgraphile(pgConfig, schema, {
  graphileBuildOptions: {
    connectionFilterAllowedFieldTypes: ["String", "Int"],
  },
})

The available field types will depend on your database schema.

Enable/disable filtering by computed columns:

postgraphile(pgConfig, schema, {
  graphileBuildOptions: {
    connectionFilterComputedColumns: false, // default: true
  },
})

Enable/disable filtering on List fields:

postgraphile(pgConfig, schema, {
  graphileBuildOptions: {
    connectionFilterLists: false, // default: true
  },
})

Use alternative names (e.g. eq, ne) for operators:

postgraphile(pgConfig, schema, {
  graphileBuildOptions: {
    connectionFilterOperatorNames: {
      equalTo: "eq",
      notEqualTo: "ne",
    },
  },
})

Enable/disable filtering on related fields:

postgraphile(pgConfig, schema, {
  graphileBuildOptions: {
    connectionFilterRelations: true, // default: false
  },
})

Enable/disable filtering on functions that return setof:

postgraphile(pgConfig, schema, {
  graphileBuildOptions: {
    connectionFilterSetofFunctions: false, // default: true
  },
})

Development

To establish a test environment, create an empty Postgres database (e.g. graphile_build_test) and set a TEST_DATABASE_URL environment variable with your connection string (e.g. postgres://localhost:5432/graphile_build_test). Ensure that psql is installed locally and then run:

yarn
npm run test