1 | import { SoftwareEnvironment, Person } from '@stencila/schema'
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2 | import parser from 'docker-file-parser'
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3 |
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4 | import Doer from './Doer'
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5 |
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6 | /**
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7 | * Parser for Dockerfiles
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8 | *
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9 | * This class implements Dockerfile parsing. It extracts meta-data defined in a Dockerfile using
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10 | * the [`LABEL`](https://docs.docker.com/engine/reference/builder/#label) or
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11 | * deprecated [`MAINTAINER`](https://docs.docker.com/engine/reference/builder/#maintainer-deprecated) instructions.
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12 | * Unlike the other parsers in Dockter it does not attempt to parse out dependencies.
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13 | *
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14 | * Here "label" refers to a key in a LABEL instruction that is un-prefixed
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15 | * or has either the [`org.opencontainers.image`](https://github.com/opencontainers/image-spec/blob/master/annotations.md) prefix,
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16 | * or the deprecated [`org.label-schema`](https://github.com/label-schema/label-schema.org) prefix.
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17 | * In other words, the following are all equivalent:
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18 | *
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19 | * ```Dockerfile
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20 | * LABEL version = 1.2.0
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21 | * LABEL org.opencontainers.image.version = 1.2.0
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22 | * LABEL org.label-schema.version = 1.2.0
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23 | * ```
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24 | *
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25 | * The following [schema crosswalk](https://en.wikipedia.org/wiki/Schema_crosswalk) defines how labels in
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26 | * Dockerfiles are translated into JSON-LD properties
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27 | *
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28 | * | Label | Property (`context:type.property`)
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29 | * | --- | ----
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30 | * | `authors` | `schema:CreativeWork.author`
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31 | * | `build` |
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32 | * | `created` | `schema:SoftwareSourceCode.dateCreated`
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33 | * | `description` | `schema:Thing.description`
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34 | * | `documentation` | `schema:softwareHelp`
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35 | * | `licenses` | `schema:CreativeWork.license`
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36 | * | `maintainer` | `codemeta:SoftwareSourceCode.maintainer`
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37 | * | `ref-name` |
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38 | * | `revision` |
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39 | * | `schema-version` | `schema:schemaVersion`
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40 | * | `source` | `schema:SoftwareSourceCode.codeRepository`
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41 | * | `title` | `schema:Thing.name`
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42 | * | `url` | `schema:Thing.url`
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43 | * | `vendor` | `schema:Organization.legalName`
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44 | * | `version` | `schema:SoftwareApplication.softwareVersion`
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45 | *
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46 | */
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47 |
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48 | export default class DockerParser extends Doer {
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49 |
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50 | /**
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51 | * Parse a folder by detecting any Dockerfile
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52 | * and return a `SoftwareEnvironment` instance
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53 | */
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54 | async parse (content?: string): Promise<SoftwareEnvironment | null> {
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55 |
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56 | let dockerfile: string
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57 | if (content) {
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58 | dockerfile = content
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59 | } else {
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60 | if (!this.exists('Dockerfile')) return null
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61 | dockerfile = this.read('Dockerfile')
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62 | }
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63 |
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64 | const environ = new SoftwareEnvironment()
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65 |
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66 | // Parse instructions from the Dockerfile
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67 | const instructions = parser.parse(dockerfile)
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68 |
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69 | // Process LABEL instructions
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70 | for (let instruction of instructions.filter(instruction => instruction.name === 'LABEL')) {
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71 | for (let [key, value] of Object.entries(instruction.args)) {
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72 | // Remove recognised prefixes from key
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73 | const match = key.match(/^(org\.opencontainers\.image|org\.label-schema)\.([^ ]+)$/)
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74 | if (match) key = match[2]
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75 |
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76 | // Unquote value if necessary
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77 | if (value.startsWith('"')) value = value.substring(1)
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78 | if (value.endsWith('"')) value = value.slice(0, -1)
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79 | // Unescape spaces
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80 | value = value.replace(/\\ /, ' ')
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81 |
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82 | switch (key) {
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83 | case 'name':
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84 | environ.name = value
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85 | break
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86 | case 'description':
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87 | environ.description = value
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88 | break
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89 | case 'maintainer':
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90 | case 'author':
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91 | environ.authors.push(Person.fromText(value))
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92 | break
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93 | }
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94 | }
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95 | }
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96 |
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97 | // Process MAINTAINER instructions
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98 | for (let instruction of instructions.filter(instruction => instruction.name === 'MAINTAINER')) {
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99 | let author = ''
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100 | if (typeof instruction.args === 'string') author = instruction.args
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101 | else throw new Error(`Unexpected type of instruction arguments ${typeof instruction.args}`)
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102 | environ.authors.push(Person.fromText(author))
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103 | }
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104 |
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105 | return environ
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106 | }
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107 |
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108 | }
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