1 | import { Context } from "./Context";
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2 | import { Strategy } from "./Strategy";
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3 | import { GraphQLFieldConfig, GraphQLNamedType } from "graphql";
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4 | import { Authority, AuthorityData, Credential, CredentialData } from "./model";
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5 |
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6 | export class StrategyCollection {
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7 | public map: { [name: string]: Strategy } = {};
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8 |
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9 | public authorityMap: {
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10 | readonly [name: string]: {
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11 | new (data: AuthorityData<any> & { readonly recordId: string }): Authority<
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12 | any
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13 | >;
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14 | };
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15 | } = {};
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16 |
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17 | public credentialMap: {
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18 | readonly [name: string]: {
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19 | new (
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20 | data: CredentialData<any> & { readonly recordId: string }
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21 | ): Credential<any>;
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22 | };
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23 | } = {};
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24 |
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25 | public queryFields: {
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26 | readonly [field: string]: GraphQLFieldConfig<any, Context, any>;
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27 | } = {};
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28 |
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29 | public mutationFields: {
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30 | readonly [field: string]: GraphQLFieldConfig<any, Context, any>;
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31 | } = {};
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32 |
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33 | public types: GraphQLNamedType[] = [];
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34 |
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35 | public constructor(strategies?: Iterable<Strategy>) {
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36 | if (strategies) {
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37 | for (const strategy of strategies) {
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38 | this.add(strategy);
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39 | }
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40 | }
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41 | }
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42 |
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43 | public add(s: Strategy): StrategyCollection {
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44 | if (this.map[s.name])
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45 | throw new Error(
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46 | `INVARIANT: Multiple strategies cannot use the same identifier; "${s.name}" is used twice.`
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47 | );
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48 |
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49 | const queryFields = { ...this.queryFields };
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50 | for (const f of Object.keys(s.queryFields)) {
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51 | if (queryFields[f]) {
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52 | throw new Error(
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53 | `INVARIANT: Multiple strategies cannot use the query field; "${f}" is used twice.`
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54 | );
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55 | }
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56 |
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57 | queryFields[f] = s.queryFields[f];
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58 | }
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59 |
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60 | const mutationFields = { ...this.mutationFields };
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61 | for (const f of Object.keys(s.mutationFields)) {
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62 | if (mutationFields[f]) {
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63 | throw new Error(
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64 | `INVARIANT: Multiple strategies cannot use the mutation field; "${f}" is used twice.`
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65 | );
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66 | }
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67 |
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68 | mutationFields[f] = s.mutationFields[f];
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69 | }
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70 |
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71 | this.map = { ...this.map, [s.name]: s };
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72 | this.authorityMap = { ...this.authorityMap, [s.name]: s.authorityModel };
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73 | this.credentialMap = { ...this.credentialMap, [s.name]: s.credentialModel };
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74 | this.queryFields = queryFields;
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75 | this.mutationFields = mutationFields;
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76 | this.types = [...this.types, ...s.types];
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77 |
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78 | return this;
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79 | }
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80 |
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81 | public delete(s: Strategy): boolean {
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82 | if (!this.map[s.name]) return false;
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83 |
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84 | const map = { ...this.map };
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85 | delete map[s.name];
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86 |
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87 | const authorityMap = { ...this.authorityMap };
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88 | delete authorityMap[s.name];
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89 |
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90 | const credentialMap = { ...this.credentialMap };
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91 | delete credentialMap[s.name];
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92 |
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93 | const queryFields = { ...this.queryFields };
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94 | for (const f of Object.keys(s.queryFields)) {
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95 | delete queryFields[f];
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96 | }
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97 |
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98 | const mutationFields = { ...this.mutationFields };
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99 | for (const f of Object.keys(s.mutationFields)) {
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100 | delete mutationFields[f];
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101 | }
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102 |
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103 | this.map = map;
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104 | this.authorityMap = authorityMap;
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105 | this.credentialMap = credentialMap;
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106 | this.queryFields = queryFields;
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107 | this.mutationFields = mutationFields;
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108 | this.types = this.types.filter(t => !s.types.includes(t));
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109 |
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110 | return true;
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111 | }
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112 | }
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