Post to Mastodon from R

February 15, 2019
By

(This article was first published on r.iresmi.net, and kindly contributed to R-bloggers)

Mastodon is a decentralized microblogging platform.

We can analyse some data and directly post our findings to a Mastodon instance.

For example we can plot the different TLDs used by the Mastodon Fediverse.

library(tidyverse)
library(httr)
library(jsonlite)
library(scales)
library(ggthemes)
library(ggrepel)

# data source
url <- "https://instances.mastodon.xyz/"

mastodon <- GET(paste0(url, "instances.json")) %>% 
  content(as = "text") %>% 
  fromJSON() %>% 
  select(-info) %>% 
  filter(!str_detect(name, "((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)")) %>% # remove IP
  mutate(statuses = as.integer(statuses),
         name_clean = str_remove(str_to_lower(name), "/$|\\.$|:\\d*$"), # remove trailing dots, slashes and port number
         tld = str_replace_all(name_clean, "(.*?)(\\.[a-z0-9]*)$", "\\2")) %>% # extract TLD
  filter(! tld %in% c("0")) # remove special cases

download_time <- format(Sys.time(), tz = "UTC", usetz = TRUE)

# saveRDS(mastodon, paste0("data/mastodon_", download_time, ".rds"))

nbi <- nrow(mastodon)
nbu <- sum(mastodon$users, na.rm = TRUE)

# cleaning and
# plot the TLDs (top level domains) of Mastondon  instances -----------------------

mastodon %>% 
  filter(! str_detect(tld, "xn--")) %>% 
  group_by(tld) %>% 
  summarise(nb = n(),
            users = sum(users, na.rm = TRUE),
            statuses = sum(statuses, na.rm = TRUE)) %>% 
  filter(nb > 0 & users > 0 & statuses > 0) %>% {
  ggplot(., aes(users, statuses, label = tld, size = nb, color = nb)) +
    geom_text_repel(segment.size = 0, force = 0.5) +
    #geom_point(alpha = 0.4) +
    labs(title = "Mastodon Top Level Domains",
         subtitle = paste(nrow(.), "TLDs for", nbi, "instances having", nbu, "users -", download_time),
         x = "users", 
         y = "statuses",
         caption = paste("r.iresmi.net\ndata from", url, "\nIDN removed ; positions adapted for clarity")) +
    scale_x_log10(labels = comma) +
    scale_y_log10(labels = comma) +
    scale_color_viridis_c(trans = "log", name = "# of\ninstances", labels = function(x) round(x, 0)) +
    scale_size(range = c(3, 10), guide = FALSE) +
    theme(plot.caption = element_text(size = 7)) }

(plot_file <- paste0("img/mastodon_tld_", download_time, ".png")) %>% 
  ggsave(width = 15, height = 10, units = "cm", dpi = 100, scale = 2)

Before posting we have to create an authorization token once.

# Registration
# run this part once and write down client_id and client_secret,
# you can then comment this part

r <- POST(paste0(instance , "api/v1/apps"),
     body = list(client_name = "my_application_name",
                 redirect_uris = "urn:ietf:wg:oauth:2.0:oob",
                 scopes = "write"))
stop_for_status(r)
apps <- content(r)

paste("client_id :", apps[["client_id"]])
paste("client_secret", apps[["client_secret"]])

# end of registration ; set your client id/secret below

Login

# Your instance, login and password

instance <- "https://mastodon.cloud/"
user <- "*******"
pass <- "*******"

client_id <- "********************"
client_secret <- "******************"

# Login -------------------------------------------------------------------

r <- POST(paste0(instance , "oauth/token"),
          body = list(client_id = client_id,
                      client_secret = client_secret,
                      grant_type = "password",
                      username = user,
                      password = pass,
                      scope = "write"))
stop_for_status(r)
token <- content(r)

We can then post the created image and its accompanying status.

# post image
r <- POST(paste0(instance , "api/v1/media"),
          add_headers(Authorization = paste("Bearer", token[["access_token"]])),
          body = list(file = upload_file(plot_file)))
stop_for_status(r)
media <- content(r)

# post status
r <- POST(paste0(instance , "/api/v1/statuses"),
          add_headers(Authorization = paste("Bearer", token[["access_token"]])),
          body = list(status = paste0("#Mastodon Top Level Domains\n#Rstats\n", media[["text_url"]]),
                      "media_ids[]" = media[["id"]]))
stop_for_status(r)
statuses <- content(r)

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