1 | var json0 = require('ot-json0').type;
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2 | var ShareDBError = require('./error');
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3 |
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4 | var ERROR_CODE = ShareDBError.CODES;
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5 |
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6 | exports.projectSnapshot = projectSnapshot;
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7 | exports.projectSnapshots = projectSnapshots;
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8 | exports.projectOp = projectOp;
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9 | exports.isSnapshotAllowed = isSnapshotAllowed;
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10 | exports.isOpAllowed = isOpAllowed;
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11 |
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12 |
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13 |
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14 | function projectSnapshot(fields, snapshot) {
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15 |
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16 | if (snapshot.type && snapshot.type !== json0.uri) {
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17 | throw new Error(ERROR_CODE.ERR_TYPE_CANNOT_BE_PROJECTED, 'Cannot project snapshots of type ' + snapshot.type);
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18 | }
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19 | snapshot.data = projectData(fields, snapshot.data);
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20 | }
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21 |
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22 | function projectSnapshots(fields, snapshots) {
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23 | for (var i = 0; i < snapshots.length; i++) {
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24 | var snapshot = snapshots[i];
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25 | projectSnapshot(fields, snapshot);
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26 | }
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27 | }
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28 |
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29 | function projectOp(fields, op) {
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30 | if (op.create) {
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31 | projectSnapshot(fields, op.create);
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32 | }
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33 | if (op.op) {
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34 | op.op = projectEdit(fields, op.op);
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35 | }
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36 | }
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37 |
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38 | function projectEdit(fields, op) {
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39 |
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40 | var result = [];
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41 |
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42 | for (var i = 0; i < op.length; i++) {
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43 | var c = op[i];
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44 | var path = c.p;
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45 |
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46 | if (path.length === 0) {
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47 | var newC = {p: []};
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48 |
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49 | if (c.od !== undefined || c.oi !== undefined) {
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50 | if (c.od !== undefined) {
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51 | newC.od = projectData(fields, c.od);
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52 | }
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53 | if (c.oi !== undefined) {
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54 | newC.oi = projectData(fields, c.oi);
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55 | }
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56 | result.push(newC);
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57 | }
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58 | } else {
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59 |
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60 | if (fields[path[0]]) {
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61 | result.push(c);
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62 | }
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63 | }
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64 | }
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65 | return result;
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66 | }
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67 |
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68 | function isOpAllowed(knownType, fields, op) {
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69 | if (op.create) {
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70 | return isSnapshotAllowed(fields, op.create);
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71 | }
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72 | if (op.op) {
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73 | if (knownType && knownType !== json0.uri) return false;
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74 | return isEditAllowed(fields, op.op);
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75 | }
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76 |
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77 | return true;
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78 | }
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79 |
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80 |
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81 | function isSnapshotAllowed(fields, snapshot) {
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82 | if (snapshot.type && snapshot.type !== json0.uri) {
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83 | return false;
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84 | }
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85 | if (snapshot.data == null) {
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86 | return true;
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87 | }
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88 |
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89 | if (typeof snapshot.data !== 'object' || Array.isArray(snapshot.data)) {
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90 | return false;
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91 | }
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92 | for (var k in snapshot.data) {
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93 | if (!fields[k]) return false;
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94 | }
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95 | return true;
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96 | }
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97 |
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98 | function isEditAllowed(fields, op) {
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99 | for (var i = 0; i < op.length; i++) {
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100 | var c = op[i];
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101 | if (c.p.length === 0) {
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102 | return false;
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103 | } else if (!fields[c.p[0]]) {
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104 | return false;
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105 | }
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106 | }
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107 | return true;
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108 | }
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109 |
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110 | function projectData(fields, data) {
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111 |
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112 | if (data == null) {
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113 | return data;
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114 | }
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115 |
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116 | if (typeof data !== 'object' || Array.isArray(data)) {
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117 | return null;
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118 | }
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119 |
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120 | var result = {};
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121 | for (var key in fields) {
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122 | if (data.hasOwnProperty(key)) {
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123 | result[key] = data[key];
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124 | }
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125 | }
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126 | return result;
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127 | }
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