# this routing file is included in the hagrid http block
# it is assumed that hagrid runs on localhost:8080

# To protect against DOS, we limit the size of possible uploads.
client_max_body_size 1m;

# Change all HTTP 502 errors into 500, to avoid being "marked as dead" by GnuPG
# if we ever get a spurious 502 (e.g. during a restart of hagrid).
# See https://gitlab.com/sequoia-pgp/hagrid/issues/94
error_page 502 =500 /502;
location /502 {
    return 500;
}

# for x-accel-redirect forwards
location /keys {
    internal;
    add_header 'Access-Control-Allow-Origin' '*';
}

location /vks/v1/ {
    location ~ ^/vks/v1/by-email/([^/][^/])([^/][^/])([^/]*)$ {
        default_type application/pgp-keys;
        add_header Content-Disposition 'attachment; filename="$1$2$3.asc"';
        add_header 'Access-Control-Allow-Origin' '*';
        try_files /keys/by-email/$1/$2/$3 @fallback;
    }

    location ~ ^/vks/v1/by-fingerprint/(?:0x)?([^/][^/])([^/][^/])(..*)$ {
        default_type application/pgp-keys;
        add_header Content-Disposition 'attachment; filename="$1$2$3.asc"';
        add_header 'Access-Control-Allow-Origin' '*';
        try_files /keys/by-fpr/$1/$2/$3 @fallback;
    }

    location ~ ^/vks/v1/by-keyid/(?:0x)?([^/][^/])([^/][^/])(.*)$ {
        default_type application/pgp-keys;
        add_header Content-Disposition 'attachment; filename="$1$2$3.asc"';
        add_header 'Access-Control-Allow-Origin' '*';
        try_files /keys/by-keyid/$1/$2/$3 @fallback;
    }

    proxy_pass http://127.0.0.1:8080;
}

# Pass queries that we do not understand to hagrid.
location @fallback {
    add_header 'Access-Control-Allow-Origin' '*';
    proxy_pass http://127.0.0.1:8080;
}

# Common HKP requests.
location /pks/lookup {
    # sq keyserver get <KEYID>, gpg --receive-keys <KEYID>
    if ($args ~ "^op=get&options=mr&search=(?:0x)?([a-fA-F0-9]{16})$") {
        set $keyid $1;
        set $args "";
        rewrite . /vks/v1/by-keyid/$keyid last;
    }

    # gpg --receive-keys <FINGERPRINT>
    if ($args ~ "^op=get&options=mr&search=(?:0x)?([a-fA-F0-9]{40})$") {
        set $fingerprint $1;
        set $args "";
        rewrite . /vks/v1/by-fingerprint/$fingerprint last;
    }

    # gpg --locate-key <EMAIL>
    if ($request_uri ~ "^/pks/lookup\?op=get&options=mr&search=([^&]{3,}%40[^&]+)") {
        set $email $1;
        set $args "";
        rewrite . /vks/v1/by-email/$email last;
    }

    # forward to backend, which will like serve via x-accel-redirect
    add_header 'Access-Control-Allow-Origin' '*';
    proxy_pass http://127.0.0.1:8080;
}

location /pks {
    proxy_pass http://127.0.0.1:8080;
}

location /manage {
    proxy_pass http://127.0.0.1:8080;
}

location /verify {
    proxy_pass http://127.0.0.1:8080;
}

location /upload {
    proxy_pass http://127.0.0.1:8080;
}

# explicitly cache the home directory
location = / {
    proxy_cache static_cache;
    proxy_pass http://127.0.0.1:8080;
}

# cache "about" pages
location /about {
    proxy_cache static_cache;
    proxy_pass http://127.0.0.1:8080;
}