1 | "use strict";
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2 | Object.defineProperty(exports, "__esModule", { value: true });
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3 | var debug = require("debug");
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4 | var flatten = require("array-flatten");
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5 | var log = debug('compose-middleware');
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6 |
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7 |
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8 |
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9 | function compose() {
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10 | var handlers = [];
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11 | for (var _i = 0; _i < arguments.length; _i++) {
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12 | handlers[_i] = arguments[_i];
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13 | }
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14 | var middleware = generate(handlers);
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15 | return function (req, res, done) { return middleware(null, req, res, done); };
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16 | }
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17 | exports.compose = compose;
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18 |
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19 |
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20 |
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21 | function errors() {
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22 | var handlers = [];
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23 | for (var _i = 0; _i < arguments.length; _i++) {
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24 | handlers[_i] = arguments[_i];
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25 | }
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26 | return generate(handlers);
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27 | }
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28 | exports.errors = errors;
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29 |
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30 |
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31 |
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32 | function generate(handlers) {
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33 | var stack = flatten(handlers);
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34 | for (var _i = 0, stack_1 = stack; _i < stack_1.length; _i++) {
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35 | var handler = stack_1[_i];
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36 | if (typeof handler !== 'function') {
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37 | throw new TypeError('Handlers must be a function');
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38 | }
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39 | }
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40 | return function middleware(err, req, res, done) {
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41 | var index = -1;
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42 | function dispatch(pos, err) {
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43 | var handler = stack[pos];
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44 | index = pos;
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45 | if (index === stack.length)
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46 | return done(err);
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47 | function next(err) {
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48 | if (pos < index) {
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49 | throw new TypeError('`next()` called multiple times');
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50 | }
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51 | return dispatch(pos + 1, err);
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52 | }
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53 | try {
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54 | if (handler.length === 4) {
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55 | if (err) {
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56 | log('handle(err)', handler.name || '<anonymous>');
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57 | return handler(err, req, res, next);
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58 | }
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59 | }
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60 | else {
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61 | if (!err) {
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62 | log('handle()', handler.name || '<anonymous>');
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63 | return handler(req, res, next);
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64 | }
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65 | }
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66 | }
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67 | catch (e) {
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68 |
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69 | if (index > pos)
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70 | throw e;
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71 | log('try..catch', e);
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72 | return next(e);
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73 | }
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74 | return next(err);
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75 | }
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76 | return dispatch(0, err);
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77 | };
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78 | }
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79 |
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