1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
import { encodeBase64 } from "@std/encoding/base64";
import { getLogger } from "./logger.ts";
export type MailDeliverStateNotSent = { kind: "not-sent" };
export type MailDeliverStateDelivered = {
kind: "delivered";
deliverer: MailDeliverer;
error?: Error;
};
export type MailDeliverStateError = {
kind: "error";
deliverer: MailDeliverer;
error: Error;
};
export type MailDeliverState =
| MailDeliverStateNotSent
| MailDeliverStateDelivered
| MailDeliverStateError;
class MailParseError extends Error {
constructor(
message: string,
public readonly mail: Mail,
options?: ErrorOptions,
) {
super(message, options);
}
}
class MailDeliverError extends Error {
constructor(
message: string,
public readonly mail: Mail,
options?: ErrorOptions,
) {
super(message, options);
}
}
const eolNames = new Map([
["\n", "\\n"],
["\r", "\\r"],
["\n\r", "\\n\\r"],
]);
interface ParsedMail {
headerStr: string;
bodyStr: string;
sepStr: string;
eol: string;
}
export class Mail {
messageId: string | null = null;
awsMessageId: string | null = null;
deliverState: MailDeliverState = { kind: "not-sent" };
constructor(public raw: string) {}
setDelivered(deliverer: MailDeliverer, error?: Error) {
this.deliverState = { "kind": "delivered", deliverer, error };
}
throwDeliverError(
deliverer: MailDeliverer,
reason: string,
cause?: unknown,
): never {
const error = new MailDeliverError(
`Failed to deliver mail to ${deliverer.destination}: ${reason}`,
this,
{ cause },
);
this.deliverState = { "kind": "error", deliverer, error };
throw error;
}
toUtf8Bytes(): Uint8Array {
const utf8Encoder = new TextEncoder();
return utf8Encoder.encode(this.raw);
}
toBase64(): string {
return encodeBase64(this.raw);
}
simpleParse(): ParsedMail {
const twoEolMatch = this.raw.match(/(\r\n|\n|\r)(\r\n|\n|\r)/);
// "\r\n" is a false positive.
if (twoEolMatch == null || twoEolMatch[0] === "\r\n") {
throw new MailParseError(
"No header/body separator (2 successive EOLs) found. Cannot append headers.",
this,
);
}
const [eol, sepStr] = [twoEolMatch[1], twoEolMatch[2]];
if (eol !== sepStr) {
getLogger().warn(
`Different EOLs (${eolNames.get(eol)} \
and ${eolNames.get(sepStr)}) found in mail.`,
);
}
return {
headerStr: this.raw.slice(0, twoEolMatch.index! + eol.length),
bodyStr: this.raw.slice(twoEolMatch.index! + eol.length + sepStr.length),
sepStr,
eol,
};
}
simpleParseHeaders(): [key: string, value: string][] {
const { headerStr } = this.simpleParse();
const rawLines = headerStr.split(/\r\n|\n|\r/);
const headerLines = [];
for (const l of rawLines) {
}
}
appendHeaders(headers: [key: string, value: string][]) {
const { headerStr, bodyStr, sepStr, eol } = this.simpleParse();
const newHeaderStr = headerStr +
headers.map(([k, v]) => `${k}: ${v}${eol}`).join("");
this.raw = newHeaderStr + sepStr + bodyStr;
}
}
type MailDeliverHook = (mail: Mail) => Promise<void>;
export abstract class MailDeliverer {
preHooks: MailDeliverHook[] = [];
postHooks: MailDeliverHook[] = [];
constructor(public readonly destination: string) {}
protected doPrepare(_mail: Mail): Promise<void> {
return Promise.resolve();
}
protected abstract doDeliver(mail: Mail): Promise<void>;
protected doFinalize(_mail: Mail): Promise<void> {
return Promise.resolve();
}
async deliverRaw(raw: string): Promise<void> {
const mail = new Mail(raw);
await this.deliver(mail);
}
async deliver(mail: Mail): Promise<void> {
this.doPrepare(mail);
for (const hook of this.preHooks) {
await hook(mail);
}
await this.doDeliver(mail);
if (mail.deliverState.kind === "not-sent") {
mail.setDelivered(this);
}
for (const hook of this.postHooks) {
await hook(mail);
}
await this.doFinalize(mail);
}
}
|
