added dns-01 challenge over Cloudflare; better command line parsing; …

…cleanups

.gitignore

@@ -1,3 +1,3 @@
-*.pem
 *.crt
+*.pem
 deno.lock

README.md

@@ -1,27 +1,41 @@
 # deno-acme
 [![Latest version](https://deno.land/badge/acme/version)](https://deno.land/x/acme)
 
-Get certificates for your domains and subdomains via http challenges from an acme server.
-Use the CLI as a standalone acme client, ...
-or use the acme.ts library to use it in your own application.
+Get certificates for your domains and or your domains their subdomains from an acme server.
+Supports http-01 challenges and dns-01 challenges with domains hosted with Cloudflare's DNS server.
+Use the CLI as a standalone acme client, or use the acme.ts library to use it in your own application.
 
-## Prerequisites
-- Port 80 needs to be available on the maschine running the acme cli
-- The requested domain name(s) need to point the IP address of the maschine running the acme cli
+## Prerequisites for HTTP challenge
+- Port 80 needs to be available on the maschine running the acme cli or ...
 - (optional) Port 80 needs to be forwarded to the maschine running the acme cli
+- The requested domain name(s) need to point the IP address of the maschine running the acme cli
+
+## Prerequisites for Cloudflare DNS challenge
+- Domain and / or subdomain(s) with nameservers pointing to Cloudflare
+- Cloudflare API token with edit privileges for the given domain(s) / subdomain(s) DNS zone
 
 ## CLI
 How to get & use the CLI:
 ```
-sudo deno install -A --allow-read=. --allow-write=. --allow-net --name acme --root /usr/local/ https://deno.land/x/acme/cli.ts
-sudo acme example.com
+sudo deno install -A --allow-read=. --allow-write=. --allow-net --name acme --root /usr/local/ https://deno.land/x/[email protected]/cli.ts
+# http challenge:
+sudo acme http example.com,subdomain.example.com
+# cloudflare dns challenge:
+sudo acme cloudflare example.com,subdomain.example.com
 ```
 
 ## Library
 To use acme as a library in your application, add the following:
 ```
-import * as ACME from "https://deno.land/x/acme/acme.ts"
-const { domainCertificates } = await ACME.getCertificateForDomain("example.com", "https://acme-staging-v02.api.letsencrypt.org/directory");
+import * as ACME from "https://deno.land/x/[email protected]/acme.ts"
+
+// http challenge:
+const { domainCertificates } = await ACME.getCertificatesWithHttp("example.com", "https://acme-staging-v02.api.letsencrypt.org/directory");
+console.log(domainCertificates);
+
+// cloudflare dns challenge:
+const cloudflareToken = Deno.env.get("CLOUDFLARE_TOKEN");
+const { domainCertificates } = await ACME.getCertificatesWithCloudflare(cloudflareToken, "example.com", "https://acme-staging-v02.api.letsencrypt.org/directory");
 console.log(domainCertificates);
 ```