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internal_services.jl
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module InternalServices
import HTTP, EzXML, JSON, URIs
using DataStructures: CircularBuffer
import Glob
import ..Utils
import ..Nostr
import ..Bech32
import ..DB
import ..Media
PORT = Ref(14000)
PRINT_EXCEPTIONS = Ref(true)
server = Ref{Any}(nothing)
router = Ref{Any}(nothing)
exceptions = CircularBuffer(200)
est = Ref{Any}(nothing)
short_urls = Ref{Any}(nothing)
verified_users = Ref{Any}(nothing)
inappropriate_names = Ref{Any}(nothing)
memberships = Ref{Any}(nothing)
membership_tiers = Ref{Any}(nothing)
membership_products = Ref{Any}(nothing)
function catch_exception(body::Function, handler::Symbol, args...)
try
body()
catch ex
push!(exceptions, (handler, time(), ex, args...))
PRINT_EXCEPTIONS[] && Utils.print_exceptions()
HTTP.Response(500, "error")
end
end
function start(cache_storage::DB.CacheStorage; setup_handlers=true)
@assert isnothing(server[])
est[] = cache_storage
short_urls[] = est[].params.MembershipDBDict(Int, String, "short_urls"; connsel=est[].pqconnstr,
init_queries=["create table if not exists short_urls (
idx int8 not null,
url text not null,
path text not null,
ext text not null
)",
"create index if not exists short_urls_idx on short_urls (idx asc)",
"create index if not exists short_urls_url on short_urls (url asc)",
"create index if not exists short_urls_path on short_urls (path asc)",
])
verified_users[] = est[].params.MembershipDBDict(String, Int, "verified_users"; connsel=est[].pqconnstr,
init_queries=["create table if not exists verified_users (name varchar(200) not null, pubkey bytea not null)",
"create index if not exists verified_users_pubkey on verified_users (pubkey asc)",
"create index if not exists verified_users_name on verified_users (name asc)",
])
inappropriate_names[] = est[].params.MembershipDBDict(String, Int, "inappropriate_names"; connsel=est[].pqconnstr,
init_queries=["create table if not exists inappropriate_names (name varchar(200) primary key)",
"create index if not exists inappropriate_names_name on inappropriate_names (name asc)",
])
memberships[] = est[].params.MembershipDBDict(String, Int, "memberships"; connsel=est[].pqconnstr,
init_queries=["create table if not exists memberships (
pubkey bytea,
tier varchar(300),
valid_until timestamp,
name varchar(500),
used_storage int8
)",
"create index if not exists memberships_pubkey on memberships (pubkey asc)",
])
membership_tiers[] = est[].params.MembershipDBDict(String, Int, "membership_tiers"; connsel=est[].pqconnstr,
init_queries=["create table if not exists membership_tiers (
tier varchar(300) not null,
max_storage int8
)",
"create index if not exists membership_tiers_tier on membership_tiers (tier asc)",
])
membership_products[] = est[].params.MembershipDBDict(String, Int, "membership_products"; connsel=est[].pqconnstr,
init_queries=["create table if not exists membership_products (
product_id varchar(100) not null,
tier varchar(300),
months int,
amount_usd decimal,
max_storage int8
)",
"create index if not exists membership_products_product_id on membership_products (product_id asc)",
])
router[] = HTTP.Router()
server[] = HTTP.serve!(router[], "0.0.0.0", PORT[])
if setup_handlers
HTTP.register!(router[], "POST", "/collect_metadata", function (req::HTTP.Request)
pubkeys = JSON.parse(String(req.body))
res = try
collect_metadata(pubkeys)
catch ex
["ERROR", string(ex)]
end
return HTTP.Response(200, JSON.json(res))
end)
HTTP.register!(router[], "/.well-known/nostr.json", nostr_json_handler)
for path in ["/**", "/"]
HTTP.register!(router[], path, preview_handler)
end
HTTP.register!(router[], "/media-cache", media_cache_handler)
HTTP.register!(router[], "/link-preview", link_preview_handler)
HTTP.register!(router[], "/url-shortening", url_shortening_handler)
HTTP.register!(router[], "/url-lookup/*", url_lookup_handler)
HTTP.register!(router[], "/spam", spam_handler)
HTTP.register!(router[], "/api", api_handler)
HTTP.register!(router[], "/api/suggestions", suggestions_handler)
end
nothing
end
function stop()
@assert !isnothing(server[])
close(server[])
server[] = nothing
close(short_urls[])
short_urls[] = nothing
close(verified_users[])
verified_users[] = nothing
end
function collect_metadata(pubkeys)
cache_storage = est[]
pubkeys = [pk isa Nostr.PubKeyId ? pk : Nostr.PubKeyId(pk) for pk in pubkeys]
res = Dict()
for pk in pubkeys
haskey(res, pk) && continue
pk in cache_storage.meta_data || continue
eid = cache_storage.meta_data[pk]
eid in cache_storage.events || continue
res[pk] = cache_storage.events[eid]
end
Dict([(Nostr.hex(pk), e) for (pk, e) in res])
end
re_url = r"https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)"
# re_url = r"[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)"
function get_image_links(content)
urls = String[]
for m in eachmatch(re_url, content)
url = m.match
_, ext = splitext(lowercase(url))
if ext in [".png", ".gif", ".jpg", ".jpeg", ".webp"]
push!(urls, url)
end
end
urls
end
function content_refs_resolved(e::Nostr.Event)
cache_storage = est[]
c = replace(e.content, DB.re_hashref => function (r)
i = parse(Int, r[3:end-1]) + 1
if 1 <= i <= length(e.tags)
tag = e.tags[i]
if length(tag.fields) >= 2
if tag.fields[1] == "p"
try
c = JSON.parse(cache_storage.events[cache_storage.meta_data[Nostr.PubKeyId(tag.fields[2])]].content)
return "@"*mdtitle(c)
catch _ end
end
end
end
""
end)
replace(c, DB.re_mention => function (r)
# prefix = "nostr:npub"
# startswith(r, prefix) || return r
if !isnothing(local pk = Bech32.nip19_decode_wo_tlv(r[7:end]))
try
c = JSON.parse(cache_storage.events[cache_storage.meta_data[pk]].content)
return "@"*mdtitle(c)
catch _ end
end
r
end)
end
function mdtitle(c::Dict)
for k in ["displayName", "display_name", "name", "username"]
if haskey(c, k) && !isnothing(c[k]) && !isempty(c[k])
return strip(c[k])
end
end
""
end
function mdpubkey(cache_storage, pk)
title = description = image = ""
url = nothing
if pk in cache_storage.meta_data
c = JSON.parse(cache_storage.events[cache_storage.meta_data[pk]].content)
if c isa Dict
addr = try strip(c["nip05"]) catch _ "" end
if !isnothing(addr) && endswith(addr, "@primal.net")
url = "https://primal.net/$(split(addr, '@')[1])"
end
try title = mdtitle(c) catch _ end
description = try replace(c["about"], re_url=>"") catch _ "" end
image = try c["picture"] catch _ "" end
end
end
if !isempty(local r = DB.exec(cache_storage.media, DB.@sql("select media_url, width, height from media where url = ?1 order by (width*height) limit 1"), (image,)))
image = r[1][1]
end
return (; title, description, image, (isnothing(url) ? (;) : (; url))...)
end
function get_meta_elements(host::AbstractString, path::AbstractString)
cache_storage = est[]
title = description = image = url = ""
twitter_card = "summary"
mdpubkey_(pk) = (; url="https://$host$path", twitter_card, mdpubkey(cache_storage, pk)...)
if !isnothing(local m = match(r"^/(profile|p)/(.*)", path))
pk = string(m[2])
pk = startswith(pk, "npub") ? Bech32.nip19_decode_wo_tlv(pk) : Nostr.PubKeyId(pk)
return mdpubkey_(pk)
elseif !isnothing(local m = match(r"^/(thread|e)/(.*)", path))
eid = string(m[2])
try eid = Bech32.nip19_decode(eid) catch _ end
isnothing(eid) && (eid = try Nostr.EventId(eid) catch _ end)
if eid isa Nostr.EventId
if eid in cache_storage.events
e = cache_storage.events[eid]
url = "https://$(host)/e/$(m[2])"
description = replace(content_refs_resolved(e), re_url => "")
if e.pubkey in cache_storage.meta_data
c = JSON.parse(cache_storage.events[cache_storage.meta_data[e.pubkey]].content)
title = mdtitle(c)
image = get(c, "picture", "")
end
media_urls = DB.exec(cache_storage.event_media, "select url from event_media where event_id = ?1 limit 1", (eid,))
if !isempty(media_urls)
twitter_card = "summary_large_image"
image = media_urls[1][1]
thumbnails = DB.exec(cache_storage.dyn[:video_thumbnails], DB.@sql("select thumbnail_url from video_thumbnails where video_url = ?1 limit 1"), (image,))
if !isempty(thumbnails)
image = (thumbnails[1][1],)
else
if !isempty(local r = DB.exec(cache_storage.media, DB.@sql("select media_url, width, height from media where url = ?1 order by (width*height) limit 1"), (image,)))
image = r[1][1]
end
end
end
end
elseif eid isa Vector
if startswith(string(m[2]), "naddr")
d = Dict(eid)
for (eid,) in DB.exec(cache_storage.dyn[:parametrized_replaceable_events],
DB.@sql("select event_id from parametrized_replaceable_events where pubkey = ?1 and kind = ?2 and identifier = ?3 limit 1"),
(d[Bech32.Author], d[Bech32.Kind], d[Bech32.Special]))
eid = Nostr.EventId(eid)
if eid in cache_storage.events
e = cache_storage.events[eid]
url = "https://$(host)/e/$(m[2])"
for t in e.tags
if length(t.fields) >= 2
t.fields[1] == "title" && (title = t.fields[2])
t.fields[1] == "summary" && (description = t.fields[2])
t.fields[1] == "image" && (image = t.fields[2])
end
end
twitter_card = "summary_large_image"
end
end
end
end
return (; title, description, image, url, twitter_card)
elseif !isnothing(local m = match(r"^/downloads?", path)) && 1==1
return (;
title="Download Primal apps and source code",
description="",
image="https://primal.net/public/primal-link-preview.jpg",
url="https://primal.net/downloads",
twitter_card = "summary_large_image",
twitter_image = "https://primal.net/images/twitter-hero.jpg")
elseif !isnothing(local m = match(r"^/(\?.|$)", path)) && 1==1
return (;
title="Primal",
description="The Social Bitcoin Wallet",
image=("https://primal.net/images/primal-link-preview.jpg",),
url="https://primal.net/",
twitter_card = "summary_large_image",
twitter_image = "https://primal.net/images/twitter-hero.jpg")
elseif !isnothing(local m = match(r"^/landing$", path)) && 1==1
return (;
title="Primal",
description="The Social Bitcoin Wallet",
image="https://primal.net/images/primal-link-preview.jpg",
url="https://primal.net/",
twitter_card = "summary_large_image",
twitter_image = "https://primal.net/images/twitter-hero.jpg")
elseif !isnothing(local m = match(r"^/(.*)", path))
name = string(m[1])
if !isempty(local pks = nostr_json_query_by_name(name))
return mdpubkey_(pks[1])
end
end
return nothing
end
index_html_reading = Utils.Throttle(; period=5.0, t=0)
index_html = Ref("")
index_doc = Ref{Any}(nothing)
index_elems = Dict{Symbol, EzXML.Node}()
# index_defaults = Dict{Symbol, String}()
index_lock = ReentrantLock()
# nostr_json_reading = Utils.Throttle(; period=5.0, t=0)
# nostr_json = Ref(Dict{String, String}())
APP_ROOT = Ref("www")
# NOSTR_JSON_FILE = Ref("nostr.json")
# function get_nostr_json()
# nostr_json_reading() do
# # nostr_json[] = JSON.parse(read("$(APP_ROOT[])/.well-known/nostr.json", String))["names"]
# nostr_json[] = JSON.parse(read(NOSTR_JSON_FILE[], String))["names"]
# # nostr_json[] = Dict([name=>Nostr.hex(Nostr.PubKeyId(pk)) for (name, pk) in DB.rows(verified_users[])])
# end
# nostr_json[]
# end
nostr_json_query_lock = ReentrantLock()
function nostr_json_query_by_name(name::String)
lock(nostr_json_query_lock) do
[Nostr.PubKeyId(pk) for (pk,) in DB.exec(verified_users[], DB.@sql("select pubkey from verified_users where lower(name) = lower(?1)"), (name,))]
end
end
function nostr_json_query_by_pubkey(pubkey::Nostr.PubKeyId)
lock(nostr_json_query_lock) do
[name for (name,) in DB.exec(verified_users[], DB.@sql("select name from verified_users where pubkey = ?1"), (pubkey,))]
end
end
function preview_handler(req::HTTP.Request)
lock(index_lock) do
dochtml = index_html[]
try
host = Dict(req.headers)["Host"]
index_html_reading() do
index_html[] = read("$(APP_ROOT[])/index.html", String)
index_doc[] = doc = EzXML.parsehtml(index_html[])
for e in EzXML.findall("/html/head/meta", doc)
if haskey(e, "property") && startswith(e["property"], "og:")
# index_defaults[Symbol(e["property"][4:end])] = e["content"]
EzXML.unlink!(e)
end
end
head = EzXML.findall("/html/head", doc)[1]
for k in [:title,
:description,
:image,
:url,
]
el = EzXML.ElementNode("meta")
el["property"] = "og:$(k)"
EzXML.link!(head, el)
index_elems[k] = el
end
el = EzXML.ElementNode("meta")
el["name"] = "og:type"
el["content"] = "website"
EzXML.link!(head, el)
el = EzXML.ElementNode("meta")
el["name"] = "twitter:card"
EzXML.link!(head, el)
index_elems[:twitter_card] = el
el = EzXML.ElementNode("meta")
el["name"] = "twitter:image"
EzXML.link!(head, el)
index_elems[:twitter_image] = el
for e in EzXML.findall("/html/head/script", doc) # WARN needed to run client app in browser
EzXML.link!(e, EzXML.TextNode(" "))
end
end
if !isnothing(local mels = get_meta_elements(host, req.target))
for (k, v) in pairs(mels)
if k == :image && !isempty(v)
if v isa Tuple
v = v[1]
else
v = "https://primal.net/media-cache?u=$(URIs.escapeuri(v))"
end
end
v = strip(v)
if !isempty(v)
index_elems[k]["content"] = v
else
delete!(index_elems[k], "content")
end
end
eltitle = EzXML.findall("/html/head/title", index_doc[])[1]
for el in EzXML.nodes(eltitle)
EzXML.unlink!(el)
end
maxlen = 50
s = mels.description
s = length(s) > maxlen ? (first(s, maxlen) * "...") : s
s = strip(mels.title * ": " * s)
EzXML.link!(eltitle, EzXML.TextNode(s))
dochtml = string(index_doc[])
end
catch ex
push!(exceptions, (:preview_handler, time(), ex, req))
PRINT_EXCEPTIONS[] && Utils.print_exceptions()
end
HTTP.Response(200, HTTP.Headers(["Content-Type"=>"text/html",
"Cache-Control"=>"no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0",
]), dochtml)
end
end
function nostr_json_handler(req::HTTP.Request)
catch_exception(:nostr_json_handler, req) do
host = Dict(req.headers)["Host"]
path = req.target
uri = HTTP.URI("https://$(host)$(path)")
nj = Dict()
if !isnothing(local m = match(r"^name=(.*)", uri.query))
name = string(m[1])
if !isempty(local pks = nostr_json_query_by_name(name))
nj = Dict([name=>pks[1]])
end
end
HTTP.Response(200, HTTP.Headers(["Content-Type"=>"application/json"]), JSON.json((; names=nj), 2))
end
end
function media_cache_handler(req::HTTP.Request)
catch_exception(:media_cache_handler, req) do
host = Dict(req.headers)["Host"]
path, query = split(req.target, '?')
args = NamedTuple([Symbol(k)=>v for (k, v) in [split(s, '=') for s in split(query, '&')]])
variant = if !haskey(args, :s)
(:original, true)
else (let s=args.s
if s=="o"; :original
elseif s=="s"; :small
elseif s=="m"; :medium
elseif s=="l"; :large
else error("invalid size")
end
end,
if !haskey(args, :a); true
elseif args.a == "1"; true
elseif args.a == "0"; false
else error("invalid animated")
end)
end
send_content = !(haskey(args, :c) && args.c == "0")
# send_content = 1==1
url = string(URIs.unescapeuri(args.u))
variants = variant == (:original, true) ? [variant] : Media.all_variants
tr = @elapsed (r = Media.media_variants(est[], url, variants; sync=true))
# println("$tr $query")
if isnothing(r)
HTTP.Response(302, HTTP.Headers(["Location"=>url, "Cache-Control"=>"no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0"]))
else
resurl = r[variant]
if !send_content
HTTP.Response(302, HTTP.Headers(["Location"=>resurl, "Cache-Control"=>"no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0"]))
else
@assert startswith(resurl, Media.MEDIA_URL_ROOT[])
fp = Media.MEDIA_PATH[] * resurl[length(Media.MEDIA_URL_ROOT[])+1:end]
fpb, ext = splitext(fp)
ct = "application/octet-stream"
for (mt, ext2) in Media.mimetype_ext
if ext2 == ext
ct = mt
break
end
end
ps = splitpath(fpb)
for p in Glob.glob(ps[end]*"*", join(ps[1:end-1], '/')[2:end])
rm(p)
end
r = Media.media_variants(est[], url, variants; sync=true)
if isnothing(r)
HTTP.Response(302, HTTP.Headers(["Location"=>url, "Cache-Control"=>"no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0"]))
else
resurl = r[variant]
if !send_content
HTTP.Response(302, HTTP.Headers(["Location"=>resurl, "Cache-Control"=>"no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0"]))
else
fp = Media.MEDIA_PATH[] * resurl[length(Media.MEDIA_URL_ROOT[])+1:end]
if !isfile(fp)
HTTP.Response(302, HTTP.Headers(["Location"=>resurl, "Cache-Control"=>"no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0"]))
else
d = read(fp)
# HTTP.Response(200, HTTP.Headers(["Content-Type"=>ct, "Content-Length"=>"$(length(d))", "Cache-Control"=>"no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0"]), d)
HTTP.Response(200, HTTP.Headers(["Content-Type"=>ct, "Content-Length"=>"$(length(d))", "Cache-Control"=>"max-age=20"]), d)
end
end
end
end
end
end
end
function link_preview_handler(req::HTTP.Request)
catch_exception(:link_preview_handler, req) do
host = Dict(req.headers)["Host"]
path, query = split(req.target, '?')
args = NamedTuple([Symbol(k)=>v for (k, v) in [split(s, '=') for s in split(query, '&')]])
url = string(URIs.unescapeuri(args.u))
r = Media.fetch_resource_metadata(url)
HTTP.Response(200, api_headers, JSON.json(r))
end
end
short_urls_lock = ReentrantLock()
short_urls_chars = ['A':'Z'..., 'a':'z'...]
URL_SHORTENING_ROOT_URL = Ref("https://m.primal.net")
function url_shortening(url)
r = DB.exec(short_urls[], DB.@sql("select path, ext from short_urls where url = ?1 limit 1"), (url,))
if isempty(r)
maxidx = DB.exec(short_urls[], DB.@sql("select max(idx) from short_urls"))[1][1]
ismissing(maxidx) && (maxidx = 0)
idx = maxidx + 1
i = 1000000+idx
cs = []
while i > 0
push!(cs, short_urls_chars[i % length(short_urls_chars) + 1])
i = i ÷ length(short_urls_chars)
end
u = URIs.parse_uri(url)
ext = lowercase(splitext(u.path)[end])
spath = join(reverse(cs))
DB.exec(short_urls[], DB.@sql("insert into short_urls values (?1, ?2, ?3, ?4)"), (idx, url, spath, ext))
else
spath, ext = r[1]
end
"$(URL_SHORTENING_ROOT_URL[])/$spath$ext"
end
function url_shortening_handler(req::HTTP.Request)
catch_exception(:url_shortening_handler, req) do
lock(short_urls_lock) do
host = Dict(req.headers)["Host"]
path, query = split(req.target, '?')
args = NamedTuple([Symbol(k)=>v for (k, v) in [split(s, '=') for s in split(query, '&')]])
url = string(URIs.unescapeuri(args.u))
res = url_shortening(url)
HTTP.Response(200, HTTP.Headers(["Content-Type"=>"application/text"]), res)
end
end
end
function url_lookup_handler(req::HTTP.Request)
catch_exception(:url_lookup_handler, req) do
host = Dict(req.headers)["Host"]
spath = splitext(string(split(req.target, '/')[end]))[1]
r = DB.exec(short_urls[], DB.@sql("select url from short_urls where path = ?1 limit 1"), (spath,))
if isnothing(r)
HTTP.Response(404, "unknown url")
else
url = r[1][1]
HTTP.Response(302, HTTP.Headers(["Location"=>url]))
end
end
end
function spam_handler(req::HTTP.Request)
catch_exception(:spam_handler, req) do
host = Dict(req.headers)["Host"]
res = Main.Filterlist.get_dict()
HTTP.Response(200, HTTP.Headers(["Content-Type"=>"application/json"]), JSON.json(res, 2))
end
end
api_headers = HTTP.Headers(["Content-Type"=>"application/json",
"Access-Control-Allow-Origin"=>"*",
"Access-Control-Allow-Methods"=>"*",
"Access-Control-Allow-Headers"=>"*"
])
function api_handler(req::HTTP.Request)
catch_exception(:api_handler, req) do
req.method == "OPTIONS" && return HTTP.Response(200, api_headers, "ok")
body = String(req.body)
# @show req.method req.target body
host = Dict(req.headers)["Host"]
filt = JSON.parse(body)
funcall = Symbol(filt[1])
@assert funcall in Main.App.exposed_functions
kwargs = Pair{Symbol, Any}[Symbol(k)=>v for (k, v) in get(filt, 2, Dict())]
res = Ref{Any}(nothing)
try
Main.CacheServerHandlers.metrics_logged(funcall, kwargs; subid="http") do
wait(Threads.@spawn Base.invokelatest(Main.CacheServerHandlers.app_funcall, funcall, kwargs,
function(r)
res[] = Main.App.content_moderation_filtering_2(est[], r, funcall, kwargs)
end))
end
catch ex
PRINT_EXCEPTIONS[] && Utils.print_exceptions()
ex isa TaskFailedException && (ex = ex.task.result)
res[] = (; error=(ex isa ErrorException ? ex.msg : "error"))
end
HTTP.Response(200, api_headers, JSON.json(res[]))
end
end
function suggestions_handler(req::HTTP.Request)
catch_exception(:suggestions_handler, req) do
req.method == "OPTIONS" && return HTTP.Response(200, api_headers, "ok")
body = String(req.body)
# @show req.method req.target body
host = Dict(req.headers)["Host"]
d = JSON.parse(read(Main.App.SUGGESTED_USERS_FILE[], String))
mds = Dict{Nostr.PubKeyId, Nostr.Event}()
for (_, ms) in d
for (pubkey, name) in ms
pubkey = Nostr.PubKeyId(pubkey)
if !haskey(mds, pubkey) && pubkey in est[].meta_data
eid = est[].meta_data[pubkey]
if eid in est[].events
mds[pubkey] = est[].events[eid]
end
end
end
end
res = (;
metadata=Dict([Nostr.hex(pk)=>md for (pk, md) in mds]),
suggestions=[(; group, members=[(; name, pubkey) for (pubkey, name) in ms])
for (group, ms) in d])
HTTP.Response(200, api_headers, JSON.json(res))
end
end
end